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. Refer to
CABLE ADJUSTMENT
for adjustments.
- Refer to AUTOMATIC TRANSMISSION - 5R55N - LS article for FLUID LEVEL CHECK procedures and LINE PRESSURE CHART for line pressure specifications.
- Raise and support the vehicle.
- Remove the cooler return line (upper fitting) from the fitting on the transmission case.
- Connect one end of a hose to the cooler return line and route other end of the hose up to a point where it can be inserted into the hole at the extension housing.
- Start the engine and run it at idle with the transmission in NEUTRAL position.
- Raise the vehicle.
- Once a steady flow of fluid (without air bubbles) is observed, remove the hose from the fluid fill hole and place the hose in a measuring container for 15 seconds. After 15 seconds place the hose back into the fluid fill hole and turn the engine off. Measure the amount of fluid in the container. If adequate flow was observed, approximately 615 ml (20.8 oz) will be in the measuring container; the test is now complete.
- If the flow is not liberal, stop the engine. Disconnect the hose from the cooler return line (upper line) and connect it to the transmission outline fitting on the transmission case.
- Repeat Steps 6 and 8. If flow is now approximately 615 ml (20.8 oz) in 15 seconds, refer to TRANSMISSION FLUID COOLER - BACKFLUSHING & CLEANING . For cleaning of the cooler, refer to TRANSMISSION COOLING under DIAGNOSIS & TESTING for fluid cooler diagnosis. If the flow is still not approximately 615 ml (20.8 oz) in 15 seconds, repair the pump, main control and converter as necessary.