Transmission Fluid Cooler Flow Test

NOTE: If the transmission fluid cooler fails the transmission fluid cooler flow test a new transmission fluid cooler should be installed and the fluid cooler tubes should be cleaned and flushed.

NOTE: The following components should be checked and should be within specifications prior to carrying out this test:

^ Engine idle.
^ Check transmission fluid level.
^ Line pressure.
^ Transmission must be at normal operation temperature, 66°C-77°C (150°F-170°C).

1. Remove fluid level indicator from fluid filler tube.
2. Place funnel in fluid filler tube.
3. Position the vehicle on a hoist.
4. Prior to carrying out the Transmission Fluid Cooler Flow Test, check to see if the vehicle is equipped with an in-line fluid filter. If the vehicle is equipped with an in-line fluid filter it must be removed and discarded prior to carrying out the Transmission Fluid Cooler Flow Test and any system flushing.
5. Remove the cooler return line (top fitting) from the fitting on the transmission case.
6. Connect one end of a hose to the cooler return line 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.
7. Remove the safety stands and lower the vehicle. Insert the end of the hose into the funnel.
8. Start the engine and run it at idle with the transmission in PARK position.
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. If adequate flow was observed, approximately 322 ml (11 oz) will be in the measuring container; the test is now complete.
10. If the flow is not adequate, 322 ml (11 oz), 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 (top fitting).
11. Repeat Steps 8-9. If the flow is now approximately 322 ml (11 oz) in 15 seconds, install a new transmission fluid cooler and flush the transmission fluid cooler tubes.
12. If the flow from the case is still not adequate (322 ml (11 oz) in 15 seconds), service the pump, main control and/or torque converter.
13. Once an adequate flow has been established, install a new in-line fluid filter, if previously removed.