GM 10275682
Transmission Cooler

The a/t Oil Cooler flushing process requires use of the Oil Cooler and line flusher tool (J35944-A). Place 0.6 liters of flushing solution (20 ounces) into the j35944-a device while carefully avoiding overfill. Fitting the j35944-a cap then apply pressure to between 550 and 700 kpa (80 to 100 psi). A discharge hose must be connected to the transaxle end of the Transmission Oil Cooler pipe that supplies the lower Transmission Oil Cooler fitting. This connection leads out to a drain container. Before connecting water supply turn on and hydrate the entire pipeline, ensure j35944-a water valve maintains its off stance. The procedure should not start unless water flows through the cooler because this indicates the cooling system may be clogged. Allow water to flow through the transaxle fluid during the 10-second on position of the water valve before you close the valve and hook up the discharge hose to a 5-gallon pail that has a shop towel over it to stop water from splashing. To flush the cooler for two minutes apply water pressure through the valve then hold the trigger down using a bale clip as you mix flushing solution into the stream. Rotate the air supply to the j35944-a air valve three to five times every 15-20 seconds to create surging pressure which ensures thorough cleaning. When finished with the trigger turn off the water supply and disconnect the hoses that run to the Transmission Oil Cooler pipes. Reinsert the hoses to execute a backflush sequence where you will repeat mixing and flushing operations. The system requires one minute of water rinse then both valves are turned off and the air stream dries the system until the discharge hose no longer produces moisture. Next step involves plugging the cooler feed pipe to the transaxle and attaching the discharge hose to the Transmission Oil Cooler return pipe and securely fastening it to the oil drain container. After transaxle fluid addition begin engine operation for 30 seconds to drain water from the Transmission Oil Cooler system. Keep the fluid flow at a minimum of 1.9 liters (2 quarts) throughout this period. Check fluid delivery at the cooler feed line by disconnecting it but keep the engine running to detect any transaxle blockages or problems with the Transmission Oil Cooler pipes or fittings. Additional flushing operations must be performed while replacing the cooler when fluid flow does not improve. The final step includes pipe cooler attachment followed by fluid level adjustment together with thorough examination of repair completion and leak inspection.

Position the auxiliary transaxle oil cooler and install the auxiliary transaxle oil cooler bolts to the upper radiator support, tightening them to 25 Nm (18 ft. lbs.).