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Home >> Chevrolet >> 2014 >> Volt >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Transmission Cooling System >> Diagnostic Information and Procedures >> Transmission Overheats >> Component Testing

Component Testing

  1. Perform the Fluid Leak Diagnosis .
  2. Verify airflow through the radiator is not obstructed. Refer to Radiator Cleaning .
  3. Perform the Transmission Fluid Level and Condition Check procedure.
  4. Perform the Line Pressure Check procedure.
  5. Perform the Main Fluid Pump Pressure High or Low procedure.
  6. Perform the Transmission Fluid Cooler Flushing and Flow Test .
  7. With a hand held or infra red thermometer or DT 24731  tempil stick, test for the transmission cooler supply line thermal bypass valve assembly opening at 96°C (205°F). The transmission cooler supply line temperature should be higher on the transmission side of the thermal bypass valve assembly than the cooler side until 96°C (205°F) is reached.
    • If the thermal bypass valve tests stuck closed 

      Replace the thermal bypass valve assembly.

    • If the thermal bypass valve tests normal 

      Inspect the transmission oil passages for a blockage.

    • If passages are blocked 

      Repair as necessary.

    • If passages are not blocked 
  8. All OK
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