air levelers

Hey everyone, I am new to the site, and from looking around it looks like this is a common problem. I own a 06 envoy and last night i heard the air compressor engaging while parked in the garage (which is flat, no severe slop). The vehicle was turned off and every few seconds the compressor...

I have an 03 Envoy XL. After the car sits parked for a few hours the right side sinks down and in time the whole rear sinks. I start the car and the compressor seems to be running great, and it pumps it up just fine. Perfect. I don't think this is normal and I read some threads here...