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2002 gmc envoy_slt
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Well dont panic & start changing mechanical springs in yet....

My 2002 Envoy occasionally releases all of the air out of the system, and my compressor is far from giving up the ghost. If you query the forums, you'll find that 90% of the members here with the load leveling suspension have had it lose all of the air, pump back up, and havent had problems since. Its an anomaly.

This happens mostly during fall and spring, read: during high humidity times and/or wild temperature swings.
During the summer and winter months, it never does it.

As long as you dont hear any hissing noises during normal operation and the pump isnt running non stop, or as long as your pump doesnt sound like theres a handful of rocks being tossed around as the compressor runs, you likely just experienced the usual fluke in the system of the check-valve sticking, and you've got many more miles of happy compressoring to go :D
 

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2002 gmc envoy_slt
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Since the OP stated that the Ranier was sitting on it's rear wheels, that would lead me to believe that an air line from the pump is leaking.....if an air bag was bad, just one side would go down, right?

Can't imagaine BOTH bags went bad at the same time. Spay that soapy water mixture on all the air line connections, and the lines themselves.
The compressor check valve sticks. It will release all air when this happens.

If it pumps up and doesnt happen again, it was likely the check valve. If it occurs every time he drives his Rainier, then its got a leak. ;)

Trust me, Ive been bickering with my rear air compressor since 2004 :D We are good friends (and sometimes enemies!) lol.
 
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