System Operation

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Fluid from the ATF (automatic transmission fluid) pump in the automatic transmission flows through the supply hose and pipe to the transmission fluid cooler. The fluid then flows through the transmission fluid cooler, and the return hose and pipe, to the sump of the automatic transmission.

The transmission fluid cooler is a dedicated cooler which is connected into the engine cooling system circuit. The transmission fluid is cooled by the temperature differential between the transmission fluid and the engine coolant flowing through the cooler.

Vehicles with the 2.2L DW12C diesel engine and the 8 speed transmission have a thermostatic valve located in the transmission cooler fluid supply and return lines. The valve contains a spring and wax thermostat which is closed when transmission fluid temperatures are below 69 °C (156.2 °F). At temperatures of 69 °C (156.2 °F) and above, the valve begins to open allowing the fluid to flow around the cooler. The valve is fully open at temperatures of 79 °C (174.2 °F).