A method for introducing a volume of coolant fluid in a coolant fluid circulating system in an associated diesel engine system, the coolant fluid circulating system comprising a radiator comprising, a lower region, a radiator drain proximate to the lower region, and a radiator cap, the radiator cap generally opposed to the lower region, the method being characterized in that it comprises the steps of: providing a removable device comprising: a single pressurizable coolant fluid recycling tank mounted on a transportable frame; at least one air pressure regulator and connector releasably engagable with an external pressurized air source; at least one vacuum generator; at least one pressure regulator; a pneumatic hose configured to be releasably connected to or proximate to the radiator cap of the coolant fluid circulating system; a fluid line in fluid communication with the coolant fluid recycling tank and configured to be positioned in releasable communication with lower region of radiator of the coolant fluid circulating system; establishing pneumatic connection between at least one location in the coolant fluid circulating system and the pneumatic hose of the device, wherein the pneumatic connection is made at a location on the radiator cap or proximate to the radiator cap; establishing fluid connection between the fluid line and at least one location in the fluid circulating system and the device wherein the fluid connection is made at the lowermost region of the radiator; after pneumatic and fluid connection is established, drawing a vacuum through said pneumatic connection and exerting pressure on the pressurizable coolant fluid recycling tank through a line in communication between the air pressure regulator and the pressurizable coolant fluid recycling tank; introducing the volume of coolant fluid into the coolant fluid circulating system through said fluid connection, wherein the pneumatic and fluid connections remain established during coolant fluid introduction; and after the volume of coolant introduction step has been completed, detaching the removable device from the associated diesel engine system. providing a removable device comprising: a single pressurizable coolant fluid recycling tank mounted on a transportable frame; at least one air pressure regulator and connector releasably engagable with an external pressurized air source; at least one vacuum generator; at least one pressure regulator; a pneumatic hose configured to be releasably connected to or proximate to the radiator cap of the coolant fluid circulating system; a fluid line in fluid communication with the coolant fluid recycling tank and configured to be positioned in releasable communication with lower region of radiator of the coolant fluid circulating system; establishing pneumatic connection between at least one location in the coolant fluid circulating system and the pneumatic hose of the device, wherein the pneumatic connection is made at a location on the radiator cap or proximate to the radiator cap; establishing fluid connection between the fluid line and at least one location in the fluid circulating system and the device wherein the fluid connection is made at the lowermost region of the radiator; after pneumatic and fluid connection is established, drawing a vacuum through said pneumatic connection and exerting pressure on the pressurizable coolant fluid recycling tank through a line in communication between the air pressure regulator and the pressurizable coolant fluid recycling tank; introducing the volume of coolant fluid into the coolant fluid circulating system through said fluid connection, wherein the pneumatic and fluid connections remain established during coolant fluid introduction; and after the volume of coolant introduction step has been completed, detaching the removable device from the associated diesel engine system. a single pressurizable coolant fluid recycling tank mounted on a transportable frame; at least one air pressure regulator and connector releasably engagable with an external pressurized air source; at least one vacuum generator; at least one pressure regulator; a pneumatic hose configured to be releasably connected to or proximate to the radiator cap of the coolant fluid circulating system; a fluid line in fluid communication with the coolant fluid recycling tank and configured to be positioned in releasable communication with lower region of radiator of the coolant fluid circulating system; establishing pneumatic connection between at least one location in the coolant fluid circulating system and the pneumatic hose of the device, wherein the pneumatic connection is made at a location on the radiator cap or proximate to the radiator cap; establishing fluid connection between the fluid line and at least one location in the fluid circulating system and the device wherein the fluid connection is made at the lowermost region of the radiator; after pneumatic and fluid connection is established, drawing a vacuum through said pneumatic connection and exerting pressure on the pressurizable coolant fluid recycling tank through a line in communication between the air pressure regulator and the pressurizable coolant fluid recycling tank; introducing the volume of coolant fluid into the coolant fluid circulating system through said fluid connection, wherein the pneumatic and fluid connections remain established during coolant fluid introduction; and after the volume of coolant introduction step has been completed, detaching the removable device from the associated diesel engine system.