Rear air problem

[HUMTECH]

Don't have the part# but any GM dealer should be able to get you one. Ask for A ECAS relay(electronically controlled air suspension).

[AUHUMMER]

HUMTECH---you da man!! Got the relay from the GMC dealer 25 miles away--local didn't have it. Got home and it wouldn't fit. I had asked for a ECAS relay for '03 Hummer H2. This time I followed my own long standing rule---take the part with you-- and they swapped it out. He looked it up again, and showed me where his data base had it wrong. Anyway, the correct part # is 15319851. I installed relay, put the fuse back in and ...bingo...we have air. I think it had to readjust itself or something because initially the compressor did not turn on. It didn't air up to normal ride height until I drove to work. Everything appears to be back to normal. Thanks again for the advice from all you guys---I was really dreading troubleshooting all that plumbing.

[timgco]

BY any chance do you have your air hose screwed on? THat causes issues also.

[AUHUMMER]

No, air hose is not screwed on. Guess it was just the relay.

[HUMTECH]

If you have any doors open including the liftgate the air suspension is disabled, maybe that was was your problem initially. glad it worked out for you.

[CBR_Raven]

I'm having a problem with my air suspension as well...

it's strange but my air suspension goes flat when i leave the truck parked for a while. i notice it more when i leave the truck parked overnight. however, if i push the button to raise the truck 2" in the rear before i turn the ignition off then it seems to be fine when i leave for days even. this makes me think that it can't be the airbags leaking but maybe something else going wrong. the truck has been parked for almost a week with the 2" ride height button activated and it stayed fully inflated. therefore it must not be the airbags. what could it be? pleas help

[mdoyle]

I think it's still the bags, my 03 did the same thing; it would lose air overnight but if I raised the rear it would stay up for days.

The bags develop cracks right where they flex similar to those rubber coin purses- they open when you bend them, so if you raise the rear the cracked area of the bag stays flat and doesn't leak.

After driving myself crazy looking at everything else in the system, I finally had the bags replaced and months later, they are still fine.

[CBR_Raven]

Originally Posted by AUHUMMER

HUMTECH---you da man!! Got the relay from the GMC dealer 25 miles away--local didn't have it. Got home and it wouldn't fit. I had asked for a ECAS relay for '03 Hummer H2. This time I followed my own long standing rule---take the part with you-- and they swapped it out. He looked it up again, and showed me where his data base had it wrong. Anyway, the correct part # is 15319851. I installed relay, put the fuse back in and ...bingo...we have air. I think it had to readjust itself or something because initially the compressor did not turn on. It didn't air up to normal ride height until I drove to work. Everything appears to be back to normal. Thanks again for the advice from all you guys---I was really dreading troubleshooting all that plumbing.

thanks for the part #...i changed the relay out on mine as well. it was only a 10 minute job