$5.00 "fix" for air ride compressor.... - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Brakes, Suspension, Wheels and Tires > OEM Issues

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  #1  
Old 08-29-2007, 03:54 PM
GmMan GmMan is offline
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Lightbulb $5.00 "fix" for air ride compressor....

Hi, my name is Jeremy and this is my first post. Anyway, my wife has an '02 Envoy 4wd with the air suspension in the back. Well, after sounding worse and worse, the pump finally gave out. I checked the dealer and they wanted $474.00 for a new one! Cheapest I could find it online was $370ish, which was still way more than I am willing to pay. I didn't want to get a used one, since it will probably not last too long either, giving my luck. So I figured I would take the old one off to see what I was working with. Pretty easy, just 2 13mm bolts, 2 wiring connectors, 3 (1 for each air bag and 1 for the accessory outlet in the cargo area)5/32" plastic hoses which are threaded, and 1 rubber hose for the intake of the pump which goes into the cargo area.
I pulled the ferrules off the plastic hoses, then the pieces that thread into the pump. So now I had three bare, 5/32" hoses hanging where the pump used to be. Two of them for the bags, and one still connected to a schraeder(sp?) valve in the cargo area(the one for inflating things for 2 minutes before it overheats and shuts off). So I went down to a local rubber/hose supply store and bought a 5/32" union tee with push in connections. Came home, pulled the fuse for the eacs under the hood, plugged the three hoses into the tee, and taped up the electrical connectors and intake tube to keep dirt/moisture out. Then I plugged my portable air compressor into the valve in the cargo area and pumped it up to normal ride height, which was around 50psi. It works great and it only cost $5.30! Plus, I can adjust the ride height any way I want to(within reason)!
Pics to come later tonight. Sorry for the book.
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Old 08-29-2007, 04:00 PM
GmMan GmMan is offline
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O.k., here's a picture of it.
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Old 08-29-2007, 04:05 PM
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mturner333 mturner333 is offline
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Does it hold 50 psi fairly well? I figured it would make the drive a little stiffer if it were at a constant level at all times. Good luck with it though. 5 bucks sounds a whole lot better that almost 500. Good job.
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Old 08-29-2007, 04:09 PM
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the roadie the roadie is offline
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Not a problem at all. Very clever workaround, and it's like what we do when we add Airlift1000 bags inside coil springs to get more lift or less sag under load. At this point, you could spend $125 (at summitracing.com and other vendors) and get the Airlift Load Controller II compressor, and you'd have manual control over your ride height.





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Old 08-29-2007, 04:15 PM
GmMan GmMan is offline
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Quote:
Originally Posted by mturner333 View Post
Does it hold 50 psi fairly well? I figured it would make the drive a little stiffer if it were at a constant level at all times. Good luck with it though. 5 bucks sounds a whole lot better that almost 500. Good job.
It is at about 47psi right now and it is pretty much the same as before.
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Old 08-29-2007, 04:27 PM
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ylab ylab is offline
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My understanding of air suspensions is that the airbag/air-spring allows air to escape when going over bumps.....the larger the bump, the more escapes in order to absorb the shock. Have you actually driven over a rough road to confirm the pressure remains within the airbags? (This is the way the ford units in the past have worked and would have guessed the GM system was similar). Obnoxious that the air compressor is that expensive, wonder how hard it would be to wire up a 3rd party like the one listed above to the factory harness to control pressure/hight automatically. Figure that the controller turns it on/off.
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Old 08-29-2007, 04:32 PM
GmMan GmMan is offline
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I'm assuming the bags just expand out when the suspension is compressed. With my gauge hooked up to it, I bounced up and down on the back bumper and the gauge fluctuated between 47 and 50 psi. I'm pretty sure it will be fine, but only time will tell.
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Old 08-29-2007, 05:20 PM
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MAY03LT MAY03LT is offline
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I like reading threads like this one.....thanks for sharing!
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Old 08-29-2007, 10:05 PM
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Quote:
Originally Posted by ylab View Post
My understanding of air suspensions is that the airbag/air-spring allows air to escape when going over bumps.....the larger the bump, the more escapes in order to absorb the shock. Have you actually driven over a rough road to confirm the pressure remains within the airbags? (This is the way the ford units in the past have worked and would have guessed the GM system was similar). Obnoxious that the air compressor is that expensive, wonder how hard it would be to wire up a 3rd party like the one listed above to the factory harness to control pressure/hight automatically. Figure that the controller turns it on/off.
The air bag system is actualy more of a sealed system. Once you add the pressure it stays there untill you let it out, or it slowly leaks out of fittings. The air inside the bag does compress, which is why you can get a good ride out of air because it's like haveing progressive rate springs, the harder you compress the air the stiffer it gets, but on softer bumps it just absorbs the bump with a softer rate.
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Old 09-07-2007, 01:57 PM
bysiklest bysiklest is offline
 
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Good to know

I just bought my Envoy and it has the airbags in the rear. Its good to know that standard size parts and air pressures are used. Thanks. It seems that these compressors over-heat easily, does anyone know if GM has corrected this in later models?
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