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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Hybrid/EV System Heating And Cooling) >> Diagnostic Information and Procedures >> Hybrid Cooling System Pressure Cap Testing >> Pressure Cap Testing

Pressure Cap Testing

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  1. Remove the pressure cap.
    WARNING: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.
  2. Wash the pressure cap sealing surface with water.
  3. Use the EN-24460-A  Cooling System Pressure Tester (1) with GE-46143  Radiator Cap and Surge Tank Test Adapter (2) in order to test the pressure cap.
    Fig 1: Identifying Pressure Cap Tester
    GM850101Courtesy of GENERAL MOTORS COMPANY
    NOTE: Lubricate GE-46143  Radiator Cap and Surge Tank Test Adapter and pressure cap O-rings with coolant and press cap to seat O-ring on GE-46143  Radiator Cap and Surge Tank Test Adapter before turning to engage threads.
  4. Test the pressure cap for the following conditions:
    • Pressure release when the EN-24460-A  Cooling System Pressure Tester exceeds the pressure rating of the pressure cap.
    • Maintain the rated pressure for at least 10 seconds.

      Note the rate of pressure loss.

  5. Replace the pressure cap under the following conditions:
    • The pressure cap does not release pressure which exceeds the rated pressure of the cap.
    • The pressure cap does not hold the rated pressure.
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