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 PROCEDURESAUTOMATIC LEVEL CONTROL SYSTEM LEAK TESTTOOLS REQUIRED
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Tools Required
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Tools Required
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.
J 22124-B Pressure Gage (0-300 psi)
- Disconnect the air tube from the air dryer.
- Attach the air tube to the J 22124-B pressure gage on the side opposite the toggle valve.
- Close the toggle valve.
- Apply service air pressure to the service valve and pressurize until the J 22124-B pressure gage reads 550 kPa (80 psi).
- Verify that the system maintains pressure for at least 1 minute.
- If the system does not maintain the specified pressure for the specified amount of time, check the shock absorber air sleeves, air tubes, and all connections for air leaks using a soapy water solution. Repair or replace any leaking components. Refer to Air Tube Replacement and Shock Absorber 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.