Transmission Fluid Cooler

Transmission Fluid Cooler Flow Test

NOTE: The transmission linkage/cable adjustment, fluid level, and line pressure must be within specification before performing this test. Refer to Fluid Level Check under Verification of Condition in the Diagnosis and Testing portion of this section. Refer to Line Pressure Test under Special Testing Procedures in the Diagnosis and Testing portion of this section. Refer to Section 07-05 for shift linkage/cable adjustment procedures.

1. Remove fluid level indicator (7A020) from fluid filler tube.

2. Place funnel in fluid filler tube.

3. Raise vehicle on hoist and position suitable safety stands under vehicle.

4. Remove cooler return line (rear fitting) from fitting on transmission case. Refer to Fluid Cooler Lines in the In-Vehicle Service portion of this section.

5. 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.

6. Remove safety stands and lower vehicle. Insert end of hose into funnel.

7. Start engine and run at idle with transmission in neutral range.

8. When fluid flowing from hose is all liquid, an adequate amount of fluid should be observed, approximately 946.24 ml (32 oz) delivered in 15 seconds. If adequate flow is observed, test is completed.

9. If the flow is not adequate, stop engine. Disconnect hose from cooler return line and connect it to converter-out line fitting (front fitting) on transmission case.

10. Repeat Steps 7 and 8. If flow is now adequate, refer to Section 07-02 for diagnosis of transmission fluid cooler (7A095). If flow is not adequate, service pump and/or converter assembly.

Transmission Fluid Cooler — Back Flushing/Cleaning

1. Conduct back flushing with a Rotunda Torque Converter/Oil Cooler Cleaner 014-00028 or equivalent. Test your equipment to make sure that a vigorous fluid flow is present before proceeding. Replace the system filter if flow is weak or contaminated.

2. To aid in attaching the cleaner to the transmission steel cooler lines, connect two additional rubber hoses to the transmission end of the steel transmission cooler lines as described below.

   • Connect the cleaner tank pressure line to the steel transmission cooler return line (longest line).
   • Connect a tank return hose to the steel transmission cooler pressure line (shorter line). Place the outlet end of this hose in the solvent tank reservoir.

3. Turn on solvent pump and allow the solvent to circulate a minimum of 5 minutes (cycling switch on and off will help dislodge contaminants in cooler system).

4. Switch off the solvent pump and disconnect the solvent pressure hose from the transmission cooler return line.

5. Use compressed air to blow out the cooler(s) and lines (blow air into the transmission cooler return line) until all solvent is removed.

6. Remove the rubber return hose from the remaining steel cooler line.

   
   
   
   
   

Transmission Fluid Cooler Tube Replacement

When fluid leakage is found at the transmission fluid cooler, the transmission fluid cooler must be replaced. Refer to Section 07-02.

When transmission fluid cooler steel lines must be replaced, each replacement line must be fabricated from the same size inside diameter and length steel line as the original line.

Using the old line as a guide, bend the new line as required. Add the necessary fittings, and install the line.

After the fittings have been tightened, check and add fluid as necessary. Check for fluid leaks.