Transmission Fluid Cooler Flow Test
Transmission Fluid Cooler Flow TestNOTE: The engine idle, transmission linkage/cable adjustment, fluid level and line pressure must be within specification before carrying out this test.
1. Place the transmission range selector lever into PARK.
2. With the vehicle in NEUTRAL position it on a hoist.
3. Prior to carrying out the Transmission Fluid Cooler Flow Test check to see if the vehicle is equipped with a in-line fluid filter. If the vehicle is equipped with a in-line fluid filter it must be removed and discarded prior to carrying out the Transmission Fluid Cooler Flow Test and any system flushing.
4. Using a 3/16 inch Allen key, hold the large drain plug with a wrench and remove the small (center) fluid level indicating plug.
5. Install the special tool into the pan.
6. Remove the cooler return line (upper line) from the fitting on the transmission case.
7. Connect one end of a clear hose to the cooler return line and route the other end of the hose to the special tool in the pan.
8. Lower the vehicle.
9. Start the engine and run it at idle.
10. With the engine running, the vehicle in PARK position it on a hoist.
11. Once a steady flow of fluid (without air bubbles) is observed, remove the hose from the special tool and place the hose in a measuring container for 15 seconds. After 15 seconds, place the hose back onto the special tool. Lower the vehicle and turn the engine off. Measure the amount of fluid in the container. If adequate flow is observed, approximately 208 ml (7 oz) will be in the measuring container. The test is now complete. Reconnect the cooler line and install the fluid fill plug.
12. Once an adequate flow has been established, install a new in-line fluid filter, if previously removed.
13. Once the fluid filter has been installed, check to see if fluid will flow out of the fluid filter.
14. If the flow is not liberal, disconnect the hose from the cooler return line and connect the hose to the cooler inlet (lower fitting) on the transmission case. Reconnect the cooler return line to the case (upper fitting).
15. Repeat Steps 8-10. If the flow is now approximately 208 ml (7 oz) in 15 seconds, the cooler lines and auxiliary cooler must be cleaned. Carry out this entire test after carrying out the backflushing and cleaning procedure. If the flow is still not adequate after carrying out the backflushing and cleaning procedure, install new cooler lines and/or an auxiliary cooler. If the flow from the case is still not adequate after the installation of new cooler lines and/or an auxiliary cooler (208 ml 7 oz in 15 seconds) the pump and/or torque converter may be at fault. Carry out the appropriate procedures for diagnosis and repair.