Flushing Procedure For Trailer Tow Package

FLUSHING PROCEDURE: FOR VEHICLES EQUIPPED WITH TRAILER TOW PACKAGE, INCLUDING A COMBINATION OF AN OIL TO AIR COOLER AND OIL TO ENGINE COOLANT COOLER.

2. Locate the inlet and outlet cooler lines at the transmission, Figure 1.

2. Disconnect both cooler lines at the transmission.

3. Remove the hose connecting the two transmission oil coolers together.

4. Using a hand suction gun filled with mineral spirits, reverse flush the coolers separately by forcing mineral spirits into the transaxle inlet hose while catching the fluid coming from the other end of the cooler. Observe for the presence of debris in the exiting fluid.

5. Repeat the flushing procedure with each cooler until the exiting mineral spirits is clear and free of debris.

6. Use compressed air in intermittent spurts to blow out the remaining mineral spirits, again in the reverse direction.

3. To remove any remaining mineral spirits, 1 Quart of ATF should be pumped through each cooler using the hand suction gun.

NOTE: IF AT ANY STAGE OF THE FLUSHING PROCESS, THE FLUIDS DO NOT FLOW FREELY THROUGH THE COOLER, IT WILL BE NECESSARY TO DETERMINE WHICH COOLER(S) IS RESTRICTED AND REPLACE IT.

NOTE: IF THE VEHICLE IS EQUIPPED WITH A BYPASS VALVE, IT MUST BE REMOVED FROM THE SYSTEM AND FLUSHED SEPARATELY. TO ASSURE THE VALVE IS THOROUGHLY IT MUST BE REMOVED FROM THE H-FITTING ASSEMBLY. PAY PARTICULAR ATTENTION TO THE WAY THE BYPASS VALVE WAS INSTALLED BEFORE DISASSEMBLY, THE INLET SIDE OF THE BYPASS VALVE MUST BE CONNECTED TO THE OUTLET LINE COMING FROM THE TRANSAXLE. SHOULD THERE BE ANY QUESTION OF HOW TO REINSTALL THE BYPASS VALVE, REFER TO TSB 21-28-89.
8. Connect the cooler lines to the transaxle. Fill the transaxle to the proper level.

9. Complete the flow testing procedure outlined below.