Warning: A sudden release of pressure may cause personal injury or damage to the vehicle. The air suspension system is under pressure until the air supply lines are disconnected. Use the following precautions when servicing the air suspension system:

Note: Remove the air suspension system fuse before working on the rear suspension components or the rear axle. Failure to remove the air suspension system fuse could cause the calibration of the air suspension leveling sensors to change and the air suspension system not to function properly.

1. Remove the air suspension system fuse.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.



3. Remove the air spring compressor to frame mounting bolts.
4. Support the compressor.



5. Disconnect the air lines (3) from the air compressor (1).
6. Trim off the air line at the electrical harness with a sharp cutting tool. Leave the remaining air line in the wiring harness.

Caution: Refer to Fastener Caution in the Preface section.





Note: Ensure the color on the air supply lines match the color on the air spring compressor for reassembly.

1. Install air line to the air compressor (1) using a new fitting.

Tighten
Tighten the air supply line fitting to 2.25 N·m (20 lb in).




2. Install the air spring compressor to frame mounting bolts.

Tighten
Tighten the bolts to 20 N·m (15 lb ft).

3. Install the air line to the air spring.
4. Attach the air line to the outside of the wiring harness using wire ties.
5. Lower the vehicle.
6. Install the air suspension system fuse.

Note: When the air springs are completely deflated, an additional ignition cycle may be required to allow the compressor to completely inflate the air springs.

7. Start the vehicle and run for approximately 1 minute to ensure that the air spring leveling system is functioning properly.
8. Inspect D-height. Refer to Trim Height Inspection.
9. Inspect for leaks. If a leak is found at the air supply lines connections at the air spring compressor, replace the air supply lines. Refer to Air Suspension Air Line Replacement.