Transmission Fluid Cooler Flow Test
Transmission Fluid Cooler Flow TestNOTE: The transmission linkage/cable adjustment, fluid level and line pressure must be within specification before carrying out this test.
1. Remove the fluid level indicator from the fluid filler tube.
2. Place a funnel in the fluid filler tube.
3. Raise and support the vehicle.
4. Disconnect the cooler return tube (rear fitting) from the transmission case.
5. Connect one end of a hose to the cooler return tube and route the other end of the hose up to a point where it can be inserted into the funnel at the fluid filler tube.
6. Remove the supports and lower the vehicle.
7. Insert the end of a hose into the funnel.
8. Start the engine and run at idle with the transmission in the NEUTRAL range.
9. Once a steady flow of fluid (without air bubbles) is observed, remove the hose from the funnel and place the hose in a measuring container for 15 seconds. After 15 seconds, place the hose back into the funnel and turn the engine off. Measure the amount of fluid in the container.
There is a temperature valve in the pump. Cooler flow rates will vary according to automatic transmission fluid temperature. The use of a scan tool will determine the actual fluid temperature. If adequate flow is observed into the container, the test is now complete.
10. If adequate flow is not observed, turn off the engine. Disconnect the hose from the cooler return line (transmission inlet).
11. Disconnect the fluid cooler line from the front case fitting and connect the hose to the case fitting (converter out) and repeat Steps 7, 8 and 9.
12. If adequate flow is observed from the transmission, look for a plugged or crushed cooler line, plugged remote filter manifold orifice, and/or fluid cooler.
13. If adequate flow is still not observed, repair and or installation of a new pump and/or torque converter may be required.