Transmission Fluid Cooler Flow Test

Transmission Fluid Cooler Flow Test

NOTE: The transmission linkage/cable adjustment, fluid level and line pressure must be within specification before carrying out this test.

1. Before doing the Transmission Fluid Cooler Flow Test, examine the cooler lines for installation of an inline transmission fluid filter. If equipped with an inline fluid filter, remove and discard the inline fluid filter prior to carrying out the Transmission Fluid Cooler Flow Test and system flushing.
2. Remove the fluid level indicator from the fluid filler tube.
3. Place a funnel in the fluid filler tube.
4. Raise and support the vehicle.
5. Disconnect the cooler return tube (rear fitting) from the transmission Cooler Bypass Valve (CBV).
6. 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.
7. Remove the supports and lower the vehicle.
8. Insert the end of a hose into the funnel.
9. Start the engine and run at idle with the transmission in the NEUTRAL range.
10. 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 946.24 ml (32 ounce) will be in the measuring container; the test is now complete.

11. NOTE: If the vehicle was not equipped with a fluid filter, install a fluid filter service kit (XC3Z-7B155-AA), following the instructions supplied in the kit. If the vehicle was equipped with a fluid filter, install a new filter (XC3Z-7B155-AB).

Once an adequate flow has been established, install a new inline transmission fluid filter or filter kit assembly.
12. Once the fluid filter has been installed, check that fluid will flow out of the filter.
13. If adequate flow is not observed, turn off the engine. Disconnect the hose from the cooler return line (transmission inlet).
14. 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.
15. If adequate flow is observed from the transmission, look for a plugged cooler line and/or fluid cooler.
16. If adequate flow is still not observed, repair and/or installation of a new pump and/or torque converter may be required.