Patent ID: 7073576

Claim:
A circulation system for circulating coolant to an oil cooler for cooling oil of an automatic transmission of a motor vehicle having an engine, a radiator, a delivery conduit for delivering coolant from the engine to the radiator, and a return conduit for returning coolant from the radiator to the engine, the circulation system comprising: a thermostatic device positioned along the return conduit; an oil cooler delivery conduit connected between the oil cooler and the return conduit upstream of the thermostatic device; and a drain conduit connected from the oil cooler to the return conduit downstream of the thermostatic device, wherein the drain conduit has an exit mouth which is inserted in the return conduit and forms an angle with a central axis of the return conduit, the angle being more than 0 degrees and less than 90 degrees, and wherein the exit mouth is inserted into the return conduit to the central axis.