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Re: air suspension compressor run a lot. suspension
Hello. your air suspension is definitely leaking air somewhere. The only way to locate and repair the leak is to take it to a garage that does this type of work. Call a few local repair shops and get estimates. Regards, Joe
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Sounds like you need to check the air-bags for a leak. Unfortunately, the compressor may have wore itself out attempting to continuously provide air to the air-bag and may also need replacing. Just my $0.02 worth.
Would need to know what DTC'S - diagnostic trouble codes are stored in the module for the autoride suspension . Hooking up a professional type scan tool ,looking at input data to the module etc... Looking at a wiring diagram an testing electrical circuit's using a DMM - digital multi-meter . Reading how the system works ,what all involved in making the system work . This is how a professional Tech would go about diagnosing this .
The automatic level control (ALC) system maintains a desired rear suspension position under all types of towing, hauling and loading conditions. The following components are involved in the operation of the ALC system:
• Air line tubing--Pressurized air from the ALC compressor is pumped to each of the rear shocks via air line tubing.
• Air drier--Pressurized air from the compressor is run through a drier containing a moisture absorbing chemical preventing water accumulation in the rear shocks.
• Compressor--Supplies pressurized air to the rear shocks
• Compressor motor relay--The relay supplies battery positive voltage to the ALC compressor motor.
• Pressure sensor--The electronic suspension control module (ESCM) module provides a 5-volt reference and low reference to the ALC pressure sensor. The module receives the signal voltage that is relative to the air pressure applied to the rear shocks.
• ESCM--Controls the ALC system and electronic suspension control (ESC) system and detects failures in both. The module monitors inputs from the position sensors, and pressure sensor to determine when to raise and lower the vehicle to trim height as the vehicle is loaded or unloaded. The module limits pump activation to 255 seconds to prevent thermal damage.
• Exhaust valve--An electric solenoid activated by the ESCM to vent air pressure from the rear shocks.
• Left and right rear suspension position sensors--The module provides a 5-volt reference and low reference to all 4 of the body-to-wheel suspension position sensors. The sensors send the ESCM a signal voltage that is relative to the rear suspension ride height
• Left and right rear shock absorbers with internal air chambers and dampers--Dampens the rear suspension and maintains trim height depending on the air pressure applied.
I will try to help you. There are just a few things that can be tried for free and sometimes a better Scanner can be hooked up to diagnose the suspension system. The Scanners vary by store among Autozone, Advance, and Oreilys autoparts.
The Relays in the Powerbox could be bad. Register your vehicle on Autozone.com and get free Fusebox layouts and wiring diagrams, which are color coded.
The rear cargo lid and all 4 doorjam switches must be closed in order for the airpump to work. There should be a Master dump(vent) solenoid inside the Drivers front fender ahead of the front tire. When this solenoid corrodes, it can stick in an open position and lock out the airpump.
Inversely, if stuck in the opposite position, it can keep the car raised up.
For the airlines and suspension bags a mix of soapy water in a spray bottle will detect an air leak when sprayed on the lines and suspension bags. This will produce bubbles. But the suspension does need to have air in it for this test to work.
When you do have pressure, remember that these are high pressure lines if you go to disconnect them and protect your eyes.
There are a few parts sites like Carparts or Car-parts.com which deliver Salvaged parts directly to your door via UPS or Fed-Ex. Price comparisions give you a choice of who to buy from and the site has full contact info.
You can get a clue from how the vehicle sits. If back is down or if one side is down, a partial inflation means the pump should still be good.
In my opinion the air ride suspension is one of automobile's biggest mistakes. I see this a lot.
The first thing you must do is isolate the problem.
Jack up the back of the car and remove the rear wheels.
Now your shocks are visible. Inspect the rubber boots in the midsection of the shock, If this is worn or torn they will need to be replaced as they dry out once the integrity of the boot is jeopardized.
Next turn the key forward to turn in the compressor that you hear. And follow the thin black air lines that run into the side of the shock. A lot of times, especially on a vehicle this age, these lines will at some point rub on the frame or other item and have holes. Just listening for air leaks and running your fingers along the lines (feeling for bumps or holes) will give you a quick answer on this.
The only thing left in the system is the compressor itself, just remove the air lines from the shocks and as the compressor runs feel the end for air pressure. If you feel it the compressor is working.
Once you have isolated the issue your vehicle faces, feel free to come back and ask for assistance in replacing them. Be thourough and check everything though because 1 bad element will make future problems inevitable.
Please feel free to rate my answer and come on back to FixYa anytime.
your bags may need replaced in the rear
i have seen this many times with several different solutions to the problem
more times i have seen the air ride bags blow out-which the compressor will stil work but with holes in the bags they will not air up
sometimes i have seen the valve go bad which i believe is located on the rear diff
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.
What is probably going on is the air suspension has a leak so the compressor is breaking down. So it will run at odd times trying to make up for the times it can not run. What you need to do is look for a conversion kit. The conversion will stop all problems that you are having now and you will never have to worry about it again. I would recommend strutmasters.com. They have great prices and there kits are guaranteed to last the life of the car. I posted the link below so you can take a look.