Abstract:
A modular cooling system adapter for coupling to an orifice and applying pressure from a source of pressurized gas. The adapter includes a universal cooling orifice fitting for attaching the device to cooling system orifices of various sizes and configurations. The universal fitting preferably includes a plurality of steps having outer axially extending surfaces disposed at a slight negative angle to a plane parallel to the axial direction. The adapter may include a pressure adapter for coupling to a source of pressurized gas, such that the pressure adapter can be interchanged with other diagnostic tools including a valve assembly, a valve assembly incorporating a temperature probe and gauge and/or a pressure gauge. Additionally, the cooling system adapter is fully modular in that it allows quick disassembly for replacement of components and interchangeability of diagnostic tools.

Description:
RELATED APPLICATIONS 
     This application is a continuation-in-part of PCT/US00/41804, filed Nov. 2, 2000, which is based on U.S. Provisional Application No. 60/163,017, filed Nov. 2, 1999, now closed. 
    
    
     FIELD OF THE INVENTION 
     The invention relates generally to cooling system pressure testing devices, and more specifically to an apparatus for monitoring the internal pressure and preferably temperature of a cooling system that uses liquid coolant to facilitate temperature reduction. 
     BACKGROUND OF THE INVENTION 
     Engines, such as those in motorcycles, automobiles, and other motive vehicles, typically utilize coolant systems with liquid coolant to facilitate temperature reduction. A variety of potential problems are associated with such cooling systems. In order to diagnose these problems, it is useful to measure the pressure of the cooling system, as well as the temperature of the coolant itself, during a running cycle. In this regard, it is further advantageous for the system to have the capability to pressurize the cooling system in order to obtain these readings and locate any leaks in the system. Various apparatus are known for testing such systems by pressurization in order to detect leaks therein. Each of these apparatus, however, has shortcoming in either design or operation. 
     U.S. Pat. No. 1,776,170 to Thimblethorpe discloses a cap-like device that fits over the opening of a radiator and includes a temperature sensor and a level sensor for indicating the level and temperature of the liquid in the radiator of an automotive vehicle. 
     U.S. Pat. No. 3,255,631 to Franks discloses a pressure/temperature indicating apparatus attached to a radiator cap with a sealing mechanism. The sealing mechanism includes a spring that bears against a metal washer, serving to seal the radiator with a rubber washer. 
     U.S. Pat. No. 3,100,391 to Mansfield discloses a pressure and temperature indicator that is adapted to fit over a radiator cap of an automotive cooling system. The radiator cooling system may be pressurized using a pump or a valve stem and pressurized air. 
     U.S. Pat. No. 4,702,620 to Ford discloses an electronic thermostat having a temperature sensor, which is inserted through a cap-like device adapted to fit over the opening of the radiator. The system is designed to monitor the temperature of the coolant and the radiator over time. 
     U.S. Pat. No. 5,324,114 to Vinci discloses a device for monitoring temperature and pressure of a liquid coolant in a cooling system. Vinci includes a particularized sealant that seals around the probes of a needle from a temperature or pressure probe and reseals itself upon removal of the needle. 
     U.S. Pat. No. 5,557,966 to Corry and U.S. Pat. No. 5,760,296 to Wilson disclose cooling system pressure testing devices that utilize bladders that may be inserted into an inlet in a deflated state and then inflated to couple the device to the inlet. 
     Systems available in the market typically include a pressure probe assembly and a plurality of adapter cap fittings designed to suit a variety of radiator neck configurations and sizes. Typically, such test systems require 25-30 different fittings in order to provide a system that may be utilized with the broad range of vehicles on the market. In use, an appropriately sized adapter cap fitting is selected to fit the radiator neck size and configuration of the cooling system being tested. The cap fitting is secured to the neck of the radiator, and a pressure probe and gas compressor coupled to the cap fitting. A typical pressure probe includes a pressure gauge, and has an outlet connectable to a selected one of the adapter cap fittings, the fitting also being adapted to receive pressurized gas from a compressor. The cooling system is then pressurized and the pressure measured. 
     Kits of this type are typically expensive and complex as they consist of a large number of parts, usually including a plurality of adapter cap fittings. Further, the range of cap fittings available generally does not cover all possible radiator neck configurations and sizes. Additionally, as these cap fittings are loose parts of a kit, they are often lost or misplaced. 
     Another attempt to simplify pressure-testing devices is the Uni-Cap Universal Cap Adapter, in which a single-size pressure probe adapter cup is permanently affixed to an expandable radiator orifice fitting. Although fitting a wide range of radiator necks, the principal disadvantage of the Uni-Cap device is that it can only be used with specific commercially available pressure probe assemblies sized to mate with the permanently affixed adapter cup. This limitation reduces the flexibility of the Uni-Cap device, particularly with respect to pressure probes that do not fit the permanently affixed adapter cup. Therefore, a need exists for a truly cooling system orifice adapter that fits a wide range of radiator necks and is not limited by commercially available pressure probes. 
     Another disadvantage of the Uni-Cap design is the difficulty in repair or replacement of its components. Since the radiator cup is welded or brazed to the internal shaft, the Uni-Cap cannot be disassembled, or its components replaced without damaging the device. The universal radiator orifice fitting, for example, cannot be replaced if damaged by scale build-up in the radiator neck, improper installation, or general wear and tear. Ultimately, if any component of the Uni-Cap is damaged, the entire assembly must be rebuilt or replaced. Both alternatives are generally more costly than component replacement. 
     Other universal-type adapters are marketed by companies such as Autotestgerate Leitenberger GmbH, which markets adapters which similarly include a tapered rubber plug. One such device, which includes a conical rubber plug, is disclosed, for example, in German Application DE 32 30 146 A1. Other devices marketed by Autotestgerate Leitenberger GmbH include a stepped rubber plug, or a conical plug having a plurality of spaced, thin rings encircling the cone and distributed along the length of the cone. Autotestgerate Leitenberger GmbH also markets a universal-type device which includes a cylindrical plug which seats along an inner surface of the radiator to seal the device to the radiator. The latter device also includes a pair of brackets which clamp around surfaces of the radiator orifice. Similar devices are marketed by at least one Taiwanese company. 
     In view of the generally conical or straight cylindrical structure of each of the devices, however, even when properly placed on a vehicle, the plug of the adapter can be ejected from the radiator opening when high pressures are developed within the radiator. Such forcible ejection not only prevents proper testing of the vehicle, it can also be extremely dangerous, causing damage to both the vehicle and the user. 
     OBJECTS OF THE INVENTION 
     An object of the present invention is to provide a diagnostic tool for measuring cooling system temperature and/or pressure, such that the tool may be conveniently utilized in a variety of applications without requiring assembly or disassembly of the diagnostic tool itself. A related object of the invention is to provide such a diagnostic tool that may be utilized to apply pressurized gas from a hand pump or the like, or directly from a shop source. 
     Another object of the invention is to provide a modular universal pressure and temperature diagnostic tool that affords easy repair and replacement of parts that are susceptible to damage and heavy wear during normal use. 
     A further object of the invention is to provide a single adapter that may be utilized in a broad range of vehicle applications, eliminating the need for multiple adapters in standard testing systems. 
     A related object is to provide an adapter which can be directly connected to standard testing systems currently available on the market, but that is not limited to use with standard testing systems or a single radiator cup size. 
     A collateral object of the invention is to provide a device that may be efficiently manufactured and repaired at a relatively low cost. 
     Another important object is to provide a device that can consistently be safely used without collateral damage to the vehicle, other property, observers or the user. It is a more specific object to provide such a device which will not be ejected from the cooling system orifice during high pressure use. 
     The present invention overcomes the disadvantages of the prior art. These and other objects and advantages of the present invention, as well as additional inventive features, will be apparent from the description of the invention provided herein. 
     BRIEF SUMMARY OF THE INVENTION 
     The invention provides a modular cooling system orifice adapter that may be utilized as a diagnostic tool for evaluating a cooling system. In one embodiment, the device includes a relatively standard size orifice cup which is adapted to mate with a number of pressure testers available on the market. In another embodiment, the adapter includes a valve assembly having a shuttle valve that may be coupled to a source of pressurized gas, preferably a hand held pump. The shuttle valve is slidably received within a valve body that is coupled to a hollow shaft that may be placed in fluid communication with the cooling system. The shuttle valve may be used to selectively apply compressed gas to the cooling system by moving the shuttle valve between an open position wherein the source of compressed gas is in fluid communication with the hollow shaft and therefore the cooling system, and a closed position wherein there is no such fluid communication. 
     The valve assembly also includes a pressure gauge, which is preferably coupled to the shuttle valve to measure the pressure of the system. A temperature gauge may also be coupled to the valve body such that it is in fluid communication with the hollow shaft for determining the temperature within the system. 
     The valve assembly or cup is preferably coupled to cooling system by a universal fitting, which allows the adapter to be utilized with many sizes and shapes of cooling system openings. The universal fitting, in the form of a rubber adapter, has an exterior surface that generally decreases in diameter, preferably consisting of a plurality of round steps. The hollow shaft extends through the universal fitting and includes an enlarged head that is disposed at the small end of the universal fitting. A plate is disposed along the shaft at the opposite end of the universal fitting as is a compression device that may be actuated to draw the head and plate toward one another so as to axially compress the universal fitting, in turn causing the steps to bulge and seal against the opening in the radiator or the like after the adapter is partially inserted into the opening. The upper edges of the substantially axially extending walls of the steps of the universal fitting are preferably angled radially inward to minimize any possibility of the fitting separating from the cooling system orifice. In this way, the lower edge of the vertical step protrudes further outward than the upper, such that sufficient interference is created to typically prevent the lower edge of the vertical step from separating from the cooling system orifice when it is axially compressed and a pressure applied to the cooling system. 
     Preferably, the adapter is modular such that it may be readily disassembled for replacement of worn out or damaged components. In this regard, the hollow shaft is preferably threaded at one end. In this way, a compression device, such as a threaded knob may be simply rotated along the shaft threads to axially compress the universal fitting. Additionally, the valve or cup assembly may be coupled to the device by threads that mate with the threaded end of the shaft. A seal or gasket disposed between the shaft and the valve assembly or cup provides a sealed connection between the interior valve assembly or cup and the hollow interior of the shaft. Those of skill in the art will appreciate that the invention so provides an adapter that may be utilized as a practical and economical diagnostic tool in a large number of applications. 
     It will further be appreciated that this modular arrangement may also be utilized with other pressure testing devices available on the market by including the standardized radiator cup assembly in place of the valve assembly. In this way, the invention provides a repairable, and therefore practical and economical alternative to the use of multiple adapters typically provided with standard pressure testing devices. 
     These and other features and advantages of the invention will be more readily apparent upon reading the following description of a preferred exemplary embodiment of the invention and upon reference to the accompanying drawings wherein: 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a side elevational view of a cooling system orifice adapter assembly constructed according to teachings of the invention. 
     FIG. 2 is a bottom view of the universal fitting of FIG.  1 . 
     FIG. 3 is an elevational view of the shaft of FIG.  1 . 
     FIG. 4 is a bottom view of the head of the shaft of FIGS. 1 and 3. 
     FIG. 5 is a plan view of the knob of FIG.  1 . 
     FIG. 6 is a cross-sectional view of the knob of FIGS. 1 and 5. 
     FIG. 7 is a plan view of the pressure plate of FIG.  1 . 
     FIG. 8 is a plan view of the radiator cup of FIG.  1 . 
     FIG. 9 is a plan view of the nut of FIG.  1 . 
     FIG. 10 is a side elevational view of an alternate embodiment of the cooling system orifice adapter including a tester. 
     FIG. 11 is an exploded elevational view of the valve assembly of FIG.  10 . 
     FIG. 12 is a plan view of the valve body of FIG.  10 . 
     FIG. 13 is a cross-sectional view of the valve body of FIGS. 11 and 12. 
     FIG. 14 is a plan view of an alternate embodiment of the pressure plate of FIG.  7 . 
     FIG. 15 is an exploded view of an alternate embodiment of the valve assembly of FIGS. 10 and 11. 
     FIG. 16 is a side elevational view of a third embodiment of the cooling system orifice adapter assembly constructed according to teachings of the invention. 
     FIG. 17 is a side elevational view of the universal fitting of FIG.  16 . 
     FIG. 18 is an end view of the universal fitting of FIGS. 16 and 17. 
     FIG. 19 is a side elevational view of the shaft of FIG.  16 . 
     FIG. 20 is an end view of the shaft of FIGS. 16 and 19. 
     FIG. 21 is an enlarged side view of the opposite end of the shaft of FIGS. 16,  19 , and  20 . 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Turning now to the drawings, FIG. 1 illustrates a side elevational view of a universal modular cooling system orifice adapter  30  constructed in accordance with teachings of the invention. According to an important feature of the invention, the adapter is of a modular assembly. This modular assembly allows a user of the invention to quickly disassemble the unit for repair or replacement of any individual component, and to easily reconfigure the device for use according to its various embodiments described herein. Moreover, disassembly and reassembly of the invention requires merely unscrewing the threaded portions of the device. 
     The adapter  30  includes a coupling assembly  32  whereby the adapter may be coupled to a broad range of sizes of radiator necks (not shown) of the cooling systems of a broad range of vehicles, and also to a pressure adapter  34  that allows the adapter  30  to be utilized with a broad range of cooling system testers (not shown) currently on the market. While the invention will be described with regard to the adapter  30  being coupled to a radiator neck, it will be appreciated that the adapter  30  may alternately be coupled to an opening of an overflow tank or other appropriate orifice. 
     The coupling assembly  32  includes a universal fitting  36  which is preferably formed of a rubber material with a durometer sufficient to withstand the axial and radial forces exerted on the fitting  36 , as well as temperatures, pressures, and other environmental stresses while providing a durable, reusable device. The universal fitting includes an exterior surface having a diameter that increases from the bottom to the top, that is, from the distal end to the proximal end. The illustrated design includes a number of steps  38  ranging from small to relatively large, each presenting a consecutively larger outer diameter. In operation, the universal fitting  36  is advanced into the radiator neck of the cooling system as deeply as possible, such that the largest diameter step  38  with a diameter smaller than the diameter of the radiator neck is disposed within the inner diameter of the radiator neck. The universal fitting  36  is then compressed axially in order to cause the universal fitting  36  to bulge outward to a greater diameter to contact and seal against the inner diameter of the radiator neck. It will be appreciated that as the universal fitting  36  continues to be axially compressed, the force exerted by the universal fitting against the inner diameter of the radiator neck, i.e., the retention force, increases. 
     In order to provide this axial compression of the universal fitting  36 , the universal fitting is provided with a bore  40 , which extends axially through the fitting  36 . A hollow shaft  42  having an enlarged head portion  44  and a central axial bore  43  is disposed within the axial bore  40  of the universal fitting  36 . As may be seen in FIG. 1, the enlarged head portion  44  of the shaft is disposed subjacent the smallest diameter step  38   a  of the fitting  36 . It will thus be appreciated that the enlarged head portion  44  of the shaft  42  exerts an upward axial force against the lowermost surface  36   a  of the universal fitting  36  as the head portion is drawn upward. 
     In order to provide a corresponding exertion of force on the uppermost surface  36   b  of the universal fitting  36 , a pressure plate or tie down plate  48  is provided. As may be seen in FIG. 7, the pressure plate  48  includes a central bore  50 , which freely receives the shaft  42 . Thus, forcing the head portion  44  of the shaft  42  and the pressure plate  48  toward each other produces an axial force on the universal fitting  36 , in turn causing the steps  38  to bulge outward. 
     To provide this axial force, the adapter  30  is provided with a compression device. In the embodiment illustrated, the shaft  42  is provided with a threaded length  46  along its external surface (see FIG. 3) along which a knob  54  having a mating, threaded inner bore  56  extending axially therethrough is disposed along the shaft  42  (see FIGS. 1,  5 - 6 ). In this way, once the user inserts the universal fitting  36  into the radiator neck or other aperture to a desired depth, the user tightens the knob  54  on the shaft  42  to exert a downward force on the pressure plate  48 , and a corresponding upward force on the universal fitting  36  by way of the head portion  44  of the shaft, to axially compress the fitting  36 . 
     The pressure plate  48  may be of any appropriate design, provided that adequate surface is provided to permit the application of force to the universal fitting  36 . In this regard, an alternate embodiment  48   a  of the pressure plate is illustrated in FIG.  14 . The pressure plate  48   a  is a flat washer-like design with a central opening  50   a  for receiving the shaft  42 . 
     A separate support ring  58  having an inner bore  60  with a diameter substantially equal to the outer diameter of the smallest diameter step  38   a  is preferably provided. The support ring  58  is particularly useful in applications where the larger diameter steps  38  are utilized to seal the radiator neck. When disposed in this way, the support ring  58  provides additional support to the thinnest portion of the universal fitting  36  and minimizes any opportunity for the universal fitting  36  to disengage the head portion  44  of the shaft  42  and slide over the head portion  44  when the universal fitting  36  is axially compressed to an excessive degree. 
     The adapter  30  may additionally be provided with a second coupling mechanism for use in conjunction with the expansion of the universal fitting  36 . In this regard, the pressure plate  48  may be provided with one or more slots  52  for receiving a chain or the like (not shown) to further mechanically couple the adapter  30  to the radiator neck. It will be appreciated by those of skill in the art that the chain-coupling structure is not necessary to the operation of the adapter  30 , nor is it necessary with regard to the sealing of the adapter to the radiator neck. Rather, it is intended and operates merely as a back-up, precautionary measure to enhance safety when operating the adapter  30 . 
     An alternate embodiment of universal fitting  136  is shown in FIGS. 16-18. In this embodiment, in order to minimize any opportunity for the universal fitting  136 , and, according, the adapter  130  to disengage from the radiator orifice when air pressure is applied to the radiator system, the substantially axially extending portions  138   a  of the steps  138  of the fitting  136  are preferably disposed at a slight negative angle α relative to normal or a line  137  disposed parallel to the axis of fitting  136 . The angle α is preferably large enough to allow the desired step  138  of the fitting  136  to be properly advanced into and placed within the radiator orifice. 
     By way of example only, the steps  138  of the currently preferred embodiment of the radiator adapter fitting  136  are on the order of 1.5 inches in maximum diameter by 0.4 inches tall (39 mm maximum diameter by 11 mm tall), 1.5 inches maximum diameter by 0.4 inches tall (37 mm maximum diameter by 11 mm tall), 1.3 inches maximum diameter by 0.5 inches tall (34 mm maximum diameter by 13 mm tall), 1.1 inches maximum diameter by 0.6 inches tall (27 mm maximum diameter by 14 mm tall), and 0.8 inches maximum diameter by 0.5 inches tall (20 mm maximum diameter by 11 mm tall). In this embodiment, it has been determined that the preferred typical angle α is on the order of 6° from normal. It will be appreciated, however, that this angle α could vary from 4° to 8°, although other angles are envisioned. It will further be appreciated that the steps themselves may have an alternate shape. For example, the substantially axially extending  138   a  wall of the universal fitting  136  may have a slight concavity, which likewise includes an angle α from normal. 
     Returning now to FIG. 1, to couple the adapter  30  to a source of pressurized gas, a pressure adapter  62  is removably disposed at the proximal end of the hollow shaft  42 . Significantly, a threaded segment  46   a  is provided at the end of the hollow shaft  42 , which mates with a threaded portion of the pressure adapter  62 . In the embodiment illustrated, the threaded segment  46   a  is contiguous with the externally threaded length  46 . It will be appreciated, however, that the pressure adapter  62  could alternately include an externally threaded portion which mates with an internally threaded segment at the proximal end of the hollow shaft bore  43 . 
     To allow the cooling system orifice adapter  30  to be coupled to most cooling system testers currently on the market for application of compressed gas and pressure testing, the pressure adapter may be in the form of a standardized radiator cup  62 . Significantly, the radiator cup  62  is removably coupled to the hollow shaft  42  by way of a coupler such as a brass nut  64 , which is welded to the lower surface of the radiator cup  62 . The internal threads within the primary bore  65  of the brass nut  64  are sized to receive the threaded segment  46   a  at the end of the shaft  42 . In this way, the cup  62  may be readily removed from the shaft  42 , the adapter  30  disassembled, and any of the modular components replaced. 
     The bottom  63  of the radiator cup  62  includes a pressure passage, here, a center bore  68 . Thus, an axial passageway is formed in the universal adapter  30  by way of center bore  68  of the radiator cup  62 , the primary bore  65  of the brass nut  64 , and the center bore  43  of the hollow shaft  42 . Those of skill in the art will appreciate that as a cooling system tester is coupled to the radiator cup  62 , pressure may be applied to the cooling system through the passageway to test the cooling system. 
     Side elevational views of the shaft  142  of the embodiment of FIGS. 16-21 are shown in FIGS. 19 and 21. In order to provide a sealed pressure passage  168  from the cup  162  through the shaft center bore  143 , the shaft  142  includes a tapered end portion  145  with an annular channel  146  for receiving an annular seal, such as an O-ring. Once assembled, the annular seal is compressed between the shaft  142  annular channel  146  and the radiator cup  162 /brass nut  164  to seal gas passage between the components. 
     Further, in order to facilitate repair of the adapter  130 , the end of the shaft  142  displaying the enlarged head portion  144  may include structure for engagement by a tool. For example, the lowermost portion of the axial bore  143  of the shaft  142  may include recessed structure  143   a  for engagement by an Allen wrench, as shown in FIG.  20 . In this way, the operator could utilize an Allen wrench engaging the shaft opening  143   a  and a wrench engaging the nut  164  disposed below the radiator cup  162  to readily disassemble the orifice adapter  130  for repair. 
     Another alternate embodiment of the invention is shown in FIG.  10 . This adapter assembly  70  is designed to provide a mechanism by which pressure may be applied to the cooling system and pressure and temperature measured directly by gauges  74 ,  76  coupled to the adapter assembly  70 . It will be appreciated by those of skill in the art, however, that a device constructed in accordance with teachings of the invention may include either, both or neither of the pressure and temperature gauges. In an arrangement that does not include a pressure gauge, however, the operator would typically utilize a pressure-testing device that would include a pressure gauge in monitoring cooling system pressures. 
     In this embodiment, the pressure adapter is in the form of a valve assembly  72  that facilitates direct application of pressure from a pressure source such as a hand pump, a compressor or shop air. An appropriate hand pump is disclosed, for example, in U.S. Pat. Nos. 4,775,302, 4,806,084, 4,954,054, 5,205,726, 5,217,354, or 5,362,214, which are hereby incorporated by reference. The adapter assembly  70  allows direct measurement of pressure and temperature within the cooling system by means of directly coupled pressure and temperature gauges  74 ,  76 , respectively. The coupling system  32  of the adapter assembly  70  is identical to that of the first embodiment illustrated in FIG. 1, and, accordingly, the reference numerals utilized with regard to the coupling assembly in this embodiment are identical to those utilized in the first embodiment. 
     Referring now to FIG. 11, there is shown an exploded view of the valve assembly  72  of this embodiment. The valve assembly comprises a valve body  80  which includes an internally threaded primary bore  82  for coupling the valve assembly to the threaded segment  46   a  at the proximal end of the threaded shaft  42  of the adapter assembly  70 . In order to provide connections to the pressure and temperature gauges  74 ,  76 , and to facilitate the application of pressure from a pressure source, the valve body further includes bores  84 ,  86 , and coupling pressure passage  88  (most clearly visible in FIG.  13 ). Bore  84  couples the threaded bore  82  to a threaded shaft  90  extending from the upper surface of the valve body  80 , the bore  84  providing an open channel between the threaded shaft  90  and the threaded bore  82 . 
     In order to couple the temperature gauge  76  to the valve body  80 , a knob  92  is provided which includes an internally threaded bore  94  for receiving the threaded shaft  90 . The knob  92  further includes a through opening  96 , which receives a temperature probe  77  and gauge  76 . To seal the temperature probe  77  in the valve assembly  72 , a stepped compression bushing  98  and O-ring  100  are provided. Preferably, the knob  92  and compression bushing  98  are formed of brass, while the O-ring  100  may be a standard rubber O-ring of an appropriate size. As may be seen in FIG. 11, the larger outer peripheral surface  98   a  of the compression bushing is sized to be received in the threaded bore  94  of the knob  92 , while the smaller outer peripheral surface  98   b  of the compression bushing  98  is sized to be received in an enlarged portion  84   a  of the bore  84 . The compression bushing  98  further includes a bore  98   c  extending axially therethrough. 
     In assembly, the temperature probe  77  is assembled into the through opening  96  and threaded bore  94  of the knob  92 , through the inner bore or internal passage  98   c  of the compression bushing  98 . The temperature probe  77  further extends through the O-ring  100  as the temperature gauge  76  is assembled into the valve body  80 . The O-ring  100  about the temperature probe  77  is disposed within the enlarged portion  84   a  of the bore  84 , and seats against the flange  84   b.  As the knob  92  is threaded downward on the threaded shaft  90 , the compression bushing exerts a force on the O-ring  100  which compresses the O-ring to seal against the temperature probe  77 . It will thus be appreciated that the temperature probe  77  so coupled to the valve assembly  72  will effectively measure the temperature within the cooling system by way of the bore  84  and the center bore  43  of shaft  42 . 
     Returning now to the valve body  80 , as illustrated in FIGS. 11-13, shuttle valve bore  86  extends substantially horizontally through valve body  80 , and is coupled to threaded bore  82  by means of the pressure passage, here, bore  88  (see FIG.  13 ). In order to apply pressure to the cooling system, shuttle valve  102  is received within pressure bore  86 . The shuttle valve comprises a central bore  104  that extends axially therethrough. The pressure gauge  74  may be coupled to axial bore  104  at end  102   a  of the shuttle valve  102  by any appropriate means, so long as adequate sealing is provided. Shuttle valve  102  further comprises radial bore  106  that opens into axial bore  104 . It will thus be appreciated by those of skill in the art that when radial bore  106  is aligned with bore  88  of the valve body, axial bore  104  of the shuttle valve  102  is in communication with the cooling system by way of threaded bore  82 , and the center bore  43  of shaft  42 . In order to seal the shuttle valve  102  within bore  86 , O-rings  108 ,  110 , and  112  are received in grooves  114 ,  116 , and  118  along the circumferential surface of the shuttle valve  102  along either side of radial bore  106  and a closed circumferential surface  128 . 
     Travel of the shuttle valve  102  within bore  86  of the valve body  80  is limited by snap rings  120 ,  122  received in grooves  124 ,  126  along the circumferential surface of the shuttle valve  102 , although alternate travel limiting structure may be provided. In this way, the shuttle valve  102  may be shuttled between an open position and a closed position. The open position is defined by a configuration in which the radial bore  106  is aligned with bore  88  in valve body  80  such that the axial bore  104  of the shuttle valve  102  is in communication with bore  88  of the valve body  80  and, accordingly, center bore  43  of shaft  42  and ultimately with the cooling system. The closed position of the shuttle valve  102  is defined by the circumferential surface  128  of the shuttle valve being in alignment with bore  88  of the valve body  80  such that the axial bore  104  of the shuttle valve is not in communication with the cooling system. It will be appreciated that when the valve assembly  72  is in the open position, the pressure within the cooling system will register on the pressure gauge  74 . 
     In order to couple a source of compressed gas to the cooling system and to supply pressurized gas to test the cooling system, the shuttle valve  102  includes a plurality of barbs  130  along the outer circumferential surface at end  102   b.  A hose  132  from a source of compressed gas, such as a hand-held pump or a compressor (not shown), may be coupled to the valve assembly  72  by way of end  102   b  of the shuttle valve  102 . 
     In the alternate embodiment  72   a  of the valve illustrated in FIG. 15, the bore  104   a  does not extend the entire distance through the shuttle valve  102   c,  but, rather, only to a distance beyond the radial bore  106   a.  Other than this shorter length bore  106   a,  the shuttle valve  102   c  and the valve body  80  in this embodiment are identical to the embodiment illustrated in FIGS. 11-13. As with the first embodiment, pressure source is in communication with the cooling system when radial bore  106   a  is aligned with bore  88  of the valve body. In this embodiment, however, pressure is read from a pressure gauge (not illustrated) associated with the source of pressurized gas. For example, the pressure may be read directly from gauge associated with a hand pump, as shown in U.S. Pat. No. 5,362,214, coupled to the valve  72   a.    
     Those of skill in the art will appreciate that, in use, the operator must first ensure that the engine has sufficiently cooled to safely remove the radiator cap. The compression knob  54  of the cooling system orifice adapter  30 ,  70  is rotated outward from the assembly (generally counterclockwise) until all compression has been relieved from the expandable rubber universal fitting  36 . The universal fitting  36  is then inserted into the filler neck of the radiator or expansion tank until a step  38  of the universal fitting  36  comes into contact with the interior wall of the filler neck. The compression knob  54  of the cooling system orifice adapter  30 ,  70  is then rotated (generally clockwise) until the universal fitting  36  comes into firm contact with the interior wall of the filler neck. To test this connection, the operator may grip the cooling system orifice adapter  30 ,  70  and carefully attempt to pull up on the adapter. The adapter  30 ,  70  should hold firmly in the filler neck. If necessary, the universal fitting  36  should be further tightened by turning the compression knob  54 . It should be noted at this point that some late model vehicles are equipped with radiator tanks and expansion tanks made of plastic. Excessive overtightening of the universal fitting  36  could result in cracking of the radiator tank or expansion tank and, accordingly, caution should be used when tightening the same. Once the cooling system orifice adapter  30 ,  70  is firmly connected to the radiator filler neck or expansion tank, the safety chain (not shown) may be coupled to the pressure plate  48  by way of the slots  52  and secured along the radiator neck as a safety precaution. In the case of the first embodiment, a radiator pressure tester of standard design may be connected to the cooling system orifice adapter  30  and the cooling system tested using a standard testing device. 
     Alternately, if the cooling system orifice adapter assembly  70  of the second embodiment is utilized, once coupled and sealed to the radiator neck or expansion tank, a source of compressed gas may be coupled to the valve assembly  72  by means of a tube  132  disposed along the barbs  130  at end  102   b  of the shuttle valve  102 . Note that when the assembly  70  is first coupled to the radiator neck or expansion tank, the pressure and temperate gauges  74 ,  76  are in place thereon. The shuttle valve  102  may then be advanced into the open position wherein the radial bore  106  is in alignment with bore  88  of the valve body  80  to open communication with the cooling system. Compressed gas is then introduced into the cooling system through the shuttle valve  102  until a desired pressure is attained, as may be read on the pressure gauge  74 . 
     The temperature may likewise be determined at this open position as registered on the temperature gauge  76 . Alternately, the temperature may be measured when the valve assembly  72  is in the closed position, that is, when the closed circumferential surface  128  of the shuttle valve  102  is in alignment with bore  88  of valve body  80 . Those of skill in the art will appreciate that in yet another embodiment, bore  84  may be eliminated such that the assembly measures only system pressure. During use, pressure may be added to the system as desired by way of the source of compressed gas. 
     Once all desired testing is complete, the valve assembly  72  may be moved into the closed position, that is, the shuttle valve  102  may be advanced to the left as illustrated in such FIGS. 10 and 11 that the closed circumferential surface  128  of the shuttle valve  102  is in alignment with the bore  88  of the valve body  80 . In releasing the pressurized gas from the cooling system, it is common for some of the hot fluid to be expelled through the testing device. Accordingly, in order to minimize the opportunity for injury as a result of such expulsion of hot liquid or hot gas, the hose, while still connected to the valve assembly, may be disconnected from the source of pressurized gas, and the hose moved to an overflow tank, or other receptacle. The valve assembly  72  may then be advanced to the open position, that is, the shuttle valve  102  may be shuttled to the right as illustrated in FIGS. 10 and 11, and the pressurized gas and/or fluid safely expelled into a designated receptacle without injury to the operator. Once all pressure is released, the compression knob  54  may be rotated to release compression on the expandable universal fitting  36  (generally counterclockwise), the security chain removed, and the radiator adapter  70  disconnected from the cooling system. 
     While this invention has been described with an emphasis upon preferred embodiments, variations of the preferred embodiments can be used and it is intended that the invention can be practiced otherwise and as specifically described herein. Accordingly, this invention includes all modifications encompassed within the spirit and scope of the invention as defined by the following. 
     All of the references cited herein, including patents, patent applications, and publications, are hereby incorporated in their entirety.