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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 226 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPRESSURE CAP TESTING
2008 Pontiac Grand Prix Base

Pressure Cap Testing

2008 Pontiac Grand Prix BaseSECTION Pressure Cap Testing
WARNING: This page is about a different car, the 2007 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

  • J 24460-01  Cooling System Pressure Tester. See Special Tools .
  • J 42401  Radiator Cap/Surge Tank Test Adapter. See Special Tools .
    CAUTION: 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.
  1. Remove the pressure cap.
  2. Wash the pressure cap sealing surface with water.
    3. Fig 1: Pressure Testing Radiator Cap
    GM850101Courtesy of GENERAL MOTORS CORP.
  3. Use the J 24460-01  (1) with J 42401  (2) in order to test the pressure cap. See Special Tools .
  4. Test the pressure cap for the following conditions:
    • Pressure release when the J 24460-01  exceeds the pressure rating of the pressure cap. See Special Tools .
    • 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.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.