Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 115 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPRESSURE CAP TESTINGTESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Pressure Cap Testing: Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Testing
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the pressure cap.
- Wash the pressure cap sealing surface with water.
- Use the J 24460-01 (1) with J 42401 (2) in order to test the pressure cap. See Special Tools .
- 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.
- 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.
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.
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.