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post #1 of 3 (permalink) Old 12-27-12, 08:26 AM Thread Starter
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2004 Air ride problems/ intermittant hissing noise front right

I have a 2004 Navi that will loose ride height after sitting for a few days. When i start it the compressor starts after a minute or so, but it never lifts, just starts hissing at the right front. if i shut the truck off, and restart sometimes it airs up with no hissing noise.

Any help or suggestions appreciated!

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post #2 of 3 (permalink) Old 12-28-12, 04:04 PM
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Re: 2004 Air ride problems/ intermittant hissing noise front right

Sounds like a loose air connection

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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post #3 of 3 (permalink) Old 12-31-12, 09:12 PM
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Re: 2004 Air ride problems/ intermittant hissing noise front right

Sitting for a few days is nothing. Most air suspensions don't last more then 24hrs outside of some HD vehicles depending on tank capacity. In fact, 3 days without significant loss of pressure is excellent.

The best way to find a leak on an air system is to get an empty spray bottle and fill it 1/3 up with dish soap, preferably red in colour - do not dilute it. Start the vehicle up, crank the wheel over so you can see the air bag/air line or find a safe alternative way to get under the vehicle. As you have the area narrowed down to where the leak might be located, locate the air lines from the compressor. Then, take your soap bottle and spray down the air line connections. You will know where the leak is when you see the soap bubbling. Before you drive away it's best to rinse the soap area off with hot water, but to each their own.

This is how I diagnose air leaks on motor coaches that have many air lines for brakes, suspension, and accessories. Worst case is an air bag has a small hole in it, as it's one of the more expensive parts to replace outside of the compressor itself.

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