2003 gmc envoy_slt
You should get at least a Haynes manual. Remove the fuse for the compressor. Support the axle and remove the pass. side tire. Support the body and the axle at ride height. Wear safety glasses when you disconnect the air lines. The air supply lines should be tightened to 20 INCH lbs. (That's not much) Compressor mounting bolts to 18 ft.lbs. There are also places to measure to get the correct height and procedures to use.