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2002 gmc envoy_slt
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69 Posts
Keep the air system... hell, see my write up today about taking the pump apart.

I did the arnott air bags few weeks ago.. super simple and they are nice.

The orig bags can leak at the top where the air line goes in, or the bottom of the bag creates dry rot cracks at the bottom where they spend most of the time folded up into itself...

use soapy water in a spray bottle to look for leaks...
 

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2002 gmc envoy_slt
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Thanks for the response. Any idea where I can start looking to try to fix the bags before I junk 'em though? I've done some searching on this forum and others, but it seems like most people aren't getting the menagerie of symptoms I am.

I guess the check valve would be a good place to start looking. Where is it located and what's its exact function? Keeping air from the bags from bleeding back into the compressor head? I guess the pressure switch could be bad too, seems to match up with the reoccurring problems better.
I'd get under there with a spray bottle of soapy water and spray the bags, usually at the bottom where they sorta fold up into themselves.. they seem to develop dry rot cracks there, you can see them better when you jack up the rear and they extend further. I found the cracks will seal themselves from air leak when they are folded up under because of pressure, but when they extend, they are straighten out and allow air to leak.

The air lines where they connect on top you prob can't see, but you can reach up there and feel for air..

spray the lines where they connect to the compressor.

The switches that activate them, if the same as my envoy, are mounted on the frame near each rear wheel... you'll see them connected to the rear axle with a rod. since the rear drops evenly, I'd doubt its those, since there is one on each side to allow air to just one bag at a time if needed.. but anything is possible.

The switch in the rear hatch only turns on the compressor and then allows air to go to the air line for accessories, not to the bags. The compressor directs the air flow using 3 solenoids inside of the compressor itself, depending on which wheel sensor is telling it needs air, or the rear hatch switch like you did...

Those can get gunked up and need cleaning, but you may not feel up to taking the compressor apart..

The air bag system works great when its working... I chose to keep bags by getting new ones as many did here because it works so well.

The compressors are crap tho... very prone to failure.

The check valve is in the compressor.. you will have to take the compressor off... and then on the outside there is a small access cover on the side, two screws holding it on. From there you can take the check valve out and clean it.. they get gunked up pretty bad too I've found..

Just guessing, but I'm thinking your bags are leaking.. with the top connection to the lines a close 2nd, and your compressor failing a close 3rd.

* If you dad decides to go w/ springs, I was about to post a want ad to buy a compressor.. so if you could keep me in mind and send me an email I would appreciate it.

Steve
 

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2002 gmc envoy_slt
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69 Posts
that stem is where you can hook an air hose to it, and then turn the pump on with the manual switch.

You can use the air hose to air up basketballs, footballs, water mattress, etc..

Vehicles came with an air hose originally, but seems that most have been lost over the years.
 
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