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 232 (SUSPENSION CONTROL SYSTEM - AUTOMATIC LEVEL CONTROL)DIAGNOSTIC INFORMATION AND PROCEDURESAIR COMPRESSOR LEAK TEST
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Air Compressor Leak Test
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Air Compressor Leak Test
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Tools Required
- J 22124-B Pressure Gage (0-300 psi)
- J 22124-91 Pressure Gage Adapter
- Attach the J 22124-91 pressure gage adapter to the air dryer.
- Attach the J 22124-B pressure gage to the J 22124-91 pressure gage adapter with the toggle valve on the opposite side of the air compressor. Close the toggle valve.
- Apply air pressure at the schrader valve. Pressurize until the J 22124-B pressure gage reads 690 kPa (100 psi).
- Check the following areas using soap bubbles:
- Solenoid valve
- Air dryer to compressor head O-ring
- Air dryer cover
- Air compressor head gasket
- Air compressor head cover - If necessary, tighten the cover bolts to 5.6 N.m (50 lb in)
If a leak is found, replace the air compressor. Refer to Air Compressor Replacement .
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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.