MY ML320 AIROMATIC SUSPENSION RISES ON ITS OWN AND WONT COME DOWN, THE PUMP, SENSORS AND THE VALVE HAVE BEEN CHANGED BY THE DEALER BUT THE PROBLEM WAW CURED TEMPORARY. THE SPORT:COMFORT BUTTON DOES NOT WORK. HOWEVER, ON SOME RARE OCCASSIONS IT CURES IT SELF TEMPORARY. IAM SICK OF TAKING IT BACK TO DEALER, ANY ONE CAN GIVE ME SOME AMMUNATION WITH KNOWLEDGE TO GO BACK TO THE DEALERS AND TELL THEM WHAT TO DO TO FIX THE PROBLEM!!!
check springs they might look fine but if only one coil has snapped then it will sit where it usually does m8 any sharp edges can be a indication, i think this vehicle has air powered/aided suspension but not 100% sure could be worth checking with mercedes, thanks jezza
if you could send me more details about fault if you know about any fault code which is recoded in engine control unit or Ignition switch control unit or trans mission control unit or whatever with chassis no of car I will try to help you my email address is [email protected]
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Go into the trunk and see if the technician turn the switch back on if he did and the vehicle still wont level out turn the switch to off position, disconnect battery, wait full 60 seconds replace battery terminal, turn switch back to on then start car this should reset the air suspension.
you mean air suspension. yes, there is a switch in the trunk i think on left side. turn it off , then open hood and on the air pump for suspension there is a regular air valve like on tires. Release the air from system, car will lower down.. then turn switch in trunk back on and start engine so the pump wont kill battery , and watch the car rise again to normal height.
Air suspension needs compressed air for the control of Air Springs (Air Spring is a cylinder like thing which goes up and down when air is pumped in and out of it). For pumping in and out the air, air compressor needs to be switched ON/OFF. Compressor relay connects and disconnects the compressor motor from the power supply ( battery). -----------------
air ride suspension compressor located under the air filter box .
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the Air compressor clutch relay location is fitted to the left hand inner wing (when viewed from the the driving seat). ------------------- the compresser is located on the left hand side of the car under the hood. once you open the hood remove the air cleaner housing and windshield washer resivor. there is a panel that you lift up under both of thoese that is where the compresser is located -------------
The air suspension uses a small, separate air compressor under the driver's side left fenderwell, with air lines running to the air bags. On the top of each air bag is a electrical valve. This is a relief valve that allows air to be exhausted when activated, and which senses the amount of air pressure within the air bag to keep both sides equal. These valves are operated via a leveling sensor that is attached to the body of the car and to the rear axle by a movable arm. When the rear of the car drops due to increased load, the arm is pushed up. When the arm is pushed up, it turns on the air compressor and fills the air bags to level the car. When the load is removed and the arm moves down, indicating that the back of the car has risen, the sensor opens the valve on the air bags and allows air to escape, lowering the car.
If the back of the car is low, indicating that the air suspension is not working, and the air suspension light is on, check the fuse first. If the fuse is all right, check the air suspension switch in the trunk and make sure it is on. This switch is used when the car is in for service. Always turn off the switch before lifting the car, because the sensor will think the car is rising and keep the air bag valves open, ruining the rear air suspension.
Turn the ignition key with the engine off. Listen for the compressor to come on while pushing down on the rear bumper. If it does not come on, test the switch terminals for power, using a circuit tester. If one terminal has power and the other does not, replace the switch. If there is power, turn the switch to the off position, raise the vehicle and place it on jack stands in the rear. Inspect the leveling switch on the axle, making sure it is not bent and is connected. Use an ohmmeter for this test. Pull the electrical connector off the switch. Loosen the arm of the switch from the axle. Test the switch with the ohmmeter by checking across both terminals while slowly moving the arm. There should be no continuity with the arm down. As the arm is raised, there should be continuity. If not, replace the switch. If there was continuity, connect the arm and the electrical connector.
Put a floor jack under the axle and raise the axle to the point where it is just beginning to lift the car off the jack stand. Turn on the ignition. Turn the air suspension switch to the "on" position. Use the circuit tester to check for power at the leveling switch. If there is power, turn the air suspension switch to "off" and lower the car. Access the air compressor in the front, under the hood, and check the electrical connector for power. If there is power, check for a good ground. If both are good, replace the compressor. If the compressor works and the car does not rise in the back, replace the air bags.
Most of the time on those units its the level sensor located on the back of the suspension system. Its a black sensor mounted to the top of the suspension with a lever that is conected to the bottom of the suspension. As the vehicle sinks the sensor tells the compressor to come on and fill up the airbags. 9 times out of ten that is the problem. you can get under the car with a flashlight and see it
that system has a pump, you should hear it run when you start the car. it also has a bleed valve. i have seen the valve get stuck before. i don't remember what year caddillac stopped putting the suspension switch in the trunk, but if the switch has been turned off the light will remain on as well. there is a level sensor under the rear of the car connected to the suspension you can try to disconnect the arm and manually move it and see if the pump kicks on. there is a few second delay before you hear the pump. if the fuses are good and the switch is on check for voltage at the pump when you move the level sensor. check for signal from the sensor. if pump runs and shock don't air up check for air leaks with soap water spray, and/or air bypassing valve. hope i helped you...dustang
I have a 2001 Allroad that had the suspension pump that continued to run, become quite loud and then it failed to keep the car at level one. This all started while under warranty but it finally failed outside of warranty and we all know that Audi denied any coverage but they offered to do the work for $1500 for a new pump and installation. I am quite handy and looked into this pump and any type of replacement parts and I found a way to replace the pump for about $350 new if you have a bit of time and are a little handy. The pumps are not made by Audi, nor Continental as the label on the pump states. They are made by a company that makes the same pumps for Range Rover, BMW, Audi and Mercedes as well as others. The pumps are the same except for the exterior mounting plates and air hookups and wire plugs. These are minor. You can find the pump for a Mercedes for $300 on eBay or approx $425 in the internet. The mounting plates on either end of the pump are swapped out in about 30min (2 strange screws on one end, drilling out 4 small rivets on the other and replacing with 4 small screw/washer/nuts). The air hose inlet/overflow and output may be different depending on the model but metric nylon quick connect fittings are available at McMaster for about $3-$8 depending on how many you need. You also may need to swap out the Audi Wire plug connector, wire crimps and heat shrink tubing. I found out a good deal about these pumps and their specs. The pumps are all similar except for their brackets and connectors to your vechile. Oh, you also have to screw in your temp sensor to the new pump and plug it in. I spent a week learning about these pumps and taking it apart. I would be happy to answer any questions you may have.
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