GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 Suspension 🢒 Automatic Level Control 🢒 Air Compressor Leak Test

Tools Required

    • J 22124-B Pressure Gage (0-300 psi)
    • J 22124-91 Pressure Gage Adapter
  1. Attach the J 22124-91 pressure gage adapter to the air dryer.
  2. 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.
  3. Apply air pressure at the schrader valve. Pressurize until the J 22124-B pressure gage reads 690 kPa (100 psi).
  4. Check the following areas using soap bubbles:
    5. • Solenoid valve -- Replace the air compressor head if leaking.
    • Air dryer to compressor head O-ring -- Replace the air dryer if leaking.
    • Air dryer cover -- Replace the air dryer if leaking.
    • Air compressor head gasket -- Replace the air compressor head if leaking.
    • Air compressor head cover gasket -- Tighten the cover bolts to 5.6 N·m (50 lb in) if the head cover gasket is leaking. If the leak persists, replace the air compressor head.