Transmission Fluid Cooler Tubes Backflushing and Cleaning

Transmission Fluid Cooler Tubes Backflushing and Cleaning









1. WARNING: Before servicing a vehicle equipped with a fire suppression system, depower the system by following the procedure in Vehicle Jacking and Lifting. Failure to follow the instructions may result in serious personal injury.

With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Vehicle Jacking and Lifting.

2. NOTICE: When internal wear/damage occurs in the transmission, metal particles, clutch plate material and band material can travel into the torque converter, the transmission fluid cooler tubes and the transmission fluid cooler. These contaminates are a major cause of recurring transmission concerns. To prevent future concerns, remove these contaminants from the cooling system before placing the transmission back into use.

NOTICE: The transmission fluid cooler is not repairable with existing equipment due to the thermostatic bypass valve. Do not attempt to backflush and clean the transmission fluid cooler. Install a new transmission fluid cooler if there is leakage from the transmission fluid cooler, major metallic failure, multiple clutch or clutch plate failure, or sufficient component wear that result in metallic contamination.

NOTICE: Use transmission fluid specified for this transmission. Do not use any supplemental transmission fluid additives or cleaning agents. The use of these products could cause internal transmission components to fail, which will affect the operation of the transmission.

NOTE: Transmission fluid cooler backflushing and cleaning will be performed using the Transmission Heated Cooler Line Flusher or equivalent. Follow the manufacturer's instructions included with the machine. Test the equipment to make sure that a vigorous fluid flow is present before proceeding.

NOTE: If the vehicle is equipped with an in-line transmission fluid filter, remove and discard the in-line filter.

If required, install a new transmission fluid cooler. For additional information, refer to Transmission Cooler, A/T.

3. Make sure to top off the fluid level of the cooler line flusher with transmission fluid.

4. Allow the transmission fluid in the cooler line flusher 15-30 minutes to warm up to 60°C (140°F) before using.

5. Install the line adapters onto the transmission cooler tubes.

6. Attach the cooler line flusher red line to the transmission fluid cooler pressure tube quick connect fitting.

7. Attach the cooler line flusher blue line to the transmission fluid cooler return tube quick connect fitting.

8. Follow the equipment instructions to purge the transmission fluid cooler tubes prior to starting the flushing procedure.

9. Allow the cooling system to backflush for 10-15 minutes, then flush in a normal flow direction for an additional 10-15 minutes.

10. WARNING: If the vehicle is equipped with a fire suppression system, repower the system. For important safety warnings and procedures, refer to Vehicle Jacking and Lifting. Failure to follow these instructions may result in serious personal injury.

If equipped with a fire suppression system, repower the system.