GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 22124-B Pressure Gage
    • J 22124-91 Pressure Gage Adapter
  1. Attach the J 22124-91 to the air dryer.
  2. Attach the J 22124-B to the J 22124-91 with the toggle valve (5) on the opposite side of the air compressor. Close the toggle valve.
  3. Apply air pressure at the schrader valve (4). Pressurize until the J 22124-B reads 690 kPa (100 psi).
  4. Check the following areas using soap bubbles:
  5. • Solenoid valve (1) -- Replace the air compressor head if leaking.
    • Air dryer to compressor head o-ring (2) -- Replace the air dryer if leaking.
    • Air dryer cover (3) -- Replace the air dryer if leaking.
    • Air compressor head gasket (6) -- Replace the air compressor head if leaking.
    • Air compressor head cover gasket (7) -- 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.