Tools Required

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Attach the J 22124-91 pressure gage adapter to the air dryer.
3. 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.
4. Apply air pressure at the schrader valve. Pressurize until the J 22124-B pressure gage reads 690 kPa (100 psi).
5. Inspect the following areas using soap bubbles:

•	Solenoid valve -- Replace the air compressor head if leaking. Refer to Automatic Level Control Air Compressor Head Replacement .

•	Air dryer to compressor head O-ring -- Replace the air dryer if leaking. Refer to Automatic Level Control Air Dryer Replacement .

•	Air dryer cover -- Replace the air dryer if leaking. Refer to Automatic Level Control Air Dryer Replacement .

•	Air compressor head gasket -- Replace the air compressor head if leaking. Refer to Automatic Level Control Air Compressor Head Replacement .

•	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. Refer to Automatic Level Control Air Compressor Head Replacement .

6. Lower the vehicle. Refer to Lifting and Jacking the Vehicle .