Load levelers must be leaking, the air pump is running
Load levelers must be leaking, the air pump is heard to be running almost constantly. I removed the air pump fuse, located under the back seat to stop the pump from burning up. Is there a problem doing this temporarily?
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Check all vacuum lines first for any possible leaks especially if you have a flow control near firewall or hoses going through firewall. If you feel hoses going to heater core, are they both hot to touch when engine at normal running temperature? Coolant level is up, and been bled properly? Did you have to add coolant lately for any reason?
Your vehicle is apparently equipped with Automatic Level Control Suspension (ALC). The thing you hear running in the rear driver's side is the air compressor that pumps up your air suspension. It is normal for this to run occasionally. Sometimes they seem a little loud. That's why they mounted it all the way in the rear and used rubber bushings to secure it...so you won't hear it running while you are driving. If it is running too much, it can be a sign that your air suspension components have air leaks. If it seems to run constantly, you need to get your suspension system checked because the pump will burn itself up trying to keep the leaky suspension inflated. VERY common as well as VERY EXPENSIVE to fix if not taken care of promptly.
If it just runs for a minute or two and shuts off and doesn't come back on for a long time, don't worry about it - this is normal. It SHOULD run for a while if you have the ignition key turned on and you load something heavy in the back of the vehicle.
you might have a leak in the rear suspension load leveler. check connections with soapy water. locate where sound is coming from. fuel pump in tank is a slight hum and not that noticable, but the air comp for load leveler is. Also spray around rubber boots on shocks, also check load leveler switch on axle to frame for broken or loose lever control.
Low fluid level in the pump resevior due to a leak at a hydrolic cylinder allowed air instead of fluid to fill the cylinders.
I then removed the pump from its mounting and elevated it as high as the connected fluid lines would allow, removed the plug,filled with trans mission fluid to within a 1/4" of the fill hole. Then cycle the top pausing at each end for 15 seconds to allow air to purge from lines & cylinders.
Recheck fluid level and plug fill hole.
Note: As of 1/18/2010 the cylinders for this model were on nationwide backorder and 300 request were in front of mine at the dealer level.
Good luck with your search for parts.
Sounds like the problem is in the air bag suspension, not the compressor. The air bags shouldn't be losing air when the car sits. The compressor adjusts the suspension level according to the load. The air bags have a valve similar to a blow up raft that allows air to pass through both ways. If when the car is running the compressor is constantly running and not turning off, the issue is within the air bags and/or the air line.