Question about 1995 Buick Park Avenue

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I have an air compressor under the hood on the drivers side that will run on and off after the car is turned off. I have no clue what this compressor does can toy tell me?

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  • nickciriglia Oct 06, 2010

    Thank you for the help and your answer was fine I should have been clear on the details with my question...

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  • Buick Master
  • 6,982 Answers

Compressor is for the air ride system. Likely if you look at the rear axle, you will find that the link between the switch and the axle has broken or fallen off.

Posted on Oct 01, 2010

  • 3 more comments 
  • Richard Scordino Oct 03, 2010

    one important item I did not mention is that if the suspension lift is leaking it will go on and off to maintain the correct pressure.

  • nickciriglia Oct 05, 2010

    Sorry but there is no air ride on this car it is all struts, shocks and coil springs and the air lines seem to run to the engine and not the frame.

  • Richard Scordino Oct 05, 2010

    You're right....That was like a one year thing and so unusual to see that I can't even remember what it was used for. Sorry for the bad answer ....my stuff is generally better than that!

  • Richard Scordino Oct 05, 2010

    Just a thought.... It may not be an air pump but a vacuum pump likely used to supplement brake operation. Check for any check valves and if you have ABS, if the malfunction light is on, it may be related.

  • Richard Scordino Oct 06, 2010

    No, I could have researched it instead of going from memory. I do this free and the ratings are a "game" I play, just to see if I can do better. I deserved a poor rating because I was flat out wrong.
    The majority of my "bad ratings" are due to the fact that the person on the other end is clueless and beyond help. Of 5,800 "solutions" I've given, only 355 (including yours) were poor. I'd say that overall I shouldn't be concerned but aside from my "game" I really try to help and in your case I did not. Sorry.

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  1. 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.
  2. 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.
  3. 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.
  4. 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.


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