How to temporarily let air out of rear air springs? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 05-05-2017, 12:58 PM
jkust jkust is offline
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2007 Buick Rainier
Imperial Blue Metallic 5.3L V8 AWD
Join Date: Feb 2009
Location: Minneapolis
Posts: 661
How to temporarily let air out of rear air springs?

Hi all, i'm still rolling along with my 07 Rainier and 07 9-7x after many years.
My question is how can I temporarily let the air out of the rear air bags allowing the rear end to sag down with a trailer attached to it.
I have a large boat that needs to fit under a garage door and even with a large drop hitch (the lowest drop I can find), need a bit more drop to get the windshield under the door opening.
I only need to back it and take it out once per year and only for a few feet but can't push the boat by hand as it is too heavy for people to push. I'd want to let the air out, allow it to sag then pull the air compressor fuse for a bit so it doesn't fill up. I just don't know how or if it is possible to let the air out manually.

5.3L, 3.73, Nav, XM, Entertaiment system, Heated leather, Moon roof, Chrome edge running boards, Chrome rims
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Old 05-11-2017, 10:12 AM
blaqyukon's Avatar
blaqyukon blaqyukon is offline
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2007 GMC Envoy Denali
Summit White 5.3L V8 4X4
Join Date: May 2017
Location: new york
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letting the air out of the air springs

well from what i see you have too loosen the lines from the compressor and find some fitting to cap off the lines, because when you loosen the air lines air will start to deflate the air bags, i think that compressor has a check valve on it, or its going to be a 2 man job one guy stay by the fuse box the other gets under the truck and loosen the lines one at a time, then pull fuse or pull fuse first then loosen the lines one at a time.. i wish my problem was that easy, mines the infrator switch is not working, and the compressor is near the tail pipe and muffler,so i quess i will take a 2x4 and wedge in between the tail pipe and push it towards the spare so i can drop the compressor to check the wiring, the dealer want to stick it too you with their prices,, i already paided $145.00 for the smoke test..
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Old 10-23-2017, 08:23 PM
Tomcat6892 Tomcat6892 is offline
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2008 GMC Envoy Denali
Black 5.3L V8 4X4
Join Date: Sep 2017
Location: Ann Arbor, mi
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Letting air out

You can let the air out at the remote air port in the back if yours has it. Itís connected to the air ride system so when you attempt to fill anything with the port it releases air from the suspension.
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Old 12-09-2017, 11:18 AM
jonwagner jonwagner is offline
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2007 GMC Envoy Denali
Olympic White 5.3L V8 4X4
Join Date: Jul 2010
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Did this work for you?
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Old 08-14-2018, 03:18 PM
gmc4flash gmc4flash is offline
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2002 GMC Envoy SLT
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not trying to hijack this thread...

but it seems to me if letting air out via the connection in the back works... and I will be testing in a day or so... then instead of removing the air compressor to deflate the airbags for replacement... then I could just push the pin in the valve inside the truck to deflate the bags prior to replacement!
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