How to Replace Gen-II Air Spring 02-06 GMC Envoy XL
Difficulty: Advanced · About 100 min · Gmc Envoy
Replace a rear air spring on a 2002–2006 GMC Envoy XL after disabling the ECAS circuit, supporting the frame and axle independently, and safely releasing air pressure before disconnecting the spring line.
Tools you will need
- 13mm Socket
- Flat Blade Screwdriver
- Torque Wrench
- Jack Stands
- 10mm Wrench
- Ratchet
- Floor Jack
- Needle nose pliers
Parts and supplies
- Rear air spring
- Air line fitting or seal
- ECAS fuse
Steps
Disable the ECAS system
Park on level ground and remove the ECAS fuse using the fuse-box diagram. Raise the vehicle at approved points, support the frame on stands, and support the axle independently so neither air spring carries vehicle weight.
Lower the spare tire
Lower and remove the spare tire to reach the compressor and air line connections. Keep the hoist hardware clear of the suspension and wiring.
Release air pressure and disconnect the line
Follow the service procedure to exhaust pressure from the air spring before releasing its line. Unplug the compressor harness, release the line fitting as designed, and protect the open line from dirt.
Remove the old air spring
Move the compressor wiring and brackets aside as needed without straining them. Release the lower spring retainer, rotate the spring to unlock its upper tab, and withdraw it from the axle mount.
Install the replacement air spring
Remove any shipping protectors and connect the air line using the fitting instructions. Position the spring with its locating tab aligned, rotate it into its locked position, and confirm the lower end is seated on the axle.
Restore the compressor and ECAS fuse
Reconnect the air lines and compressor wiring, secure the harness in its frame clips, and reinstall the spare tire. Restore the ECAS fuse only after the suspension is assembled and all connections are secure.
Inflate and inspect the spring
Lower the vehicle evenly and start the system so it can inflate the spring. Check the air line and spring fittings with an approved leak solution, confirm both sides reach normal ride height, and stop if the compressor runs continuously.
Check your vehicle’s repair manual for exact specifications and fit.