Transmission Cooler: Testing and Inspection

DIAGNOSIS AND TESTING - TRANS OIL COOLER FLOW
To test for proper transmission oil flow through the oil cooler perform the following procedure:





1. Disconnect the oil return hose at the external trans cooler (Fig. 2).





2. Using Special Tool adapters 6906-1-3 with a 9 mm (3/8 inch) transmission hose attached to one adapter, connect Special Tool 8392 flow meter in-series with the oil cooler flow circuit (Fig. 1).





3. Start engine and observe the flow meter gauge. Refer to the chart for specifications.
4. If oil flow is below minimum specifications, further diagnosis must be performed.
a. Perform Oil Pump Volume Check.
b. If oil pump volume is within specification, a possible restriction in the cooler lines or cooler has occurred.
c. If oil pump volume is not within specification, possible internal transmission restrictions, component wear or damage has occurred.
d. If an oil cooler restriction is suspected, perform further inspections and flow meter testing by isolating components (i.e. lines, coolers).
e. After a restriction is isolated, perform cooler flush procedure.
f. Re-test cooler flow. If cooler flow does not exceed minimum specification, replace component(s) as necessary.