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Thread: Ac compressor doesn't turn on

  1. #1

    Ac compressor doesn't turn on

    My Ac compressor doesn't seem to turn on. Fan is running but no compressor. Ideas?

    Thanks

  2. #2
    First thing I'd look at is the fuse(s). Check your manual for the fuse locations and the circuits they protect. Anything relating to A/C should be checked to make sure the fuse hasn't blown. With any luck it's something as simple as that.

    There is also a relay, usually in the fuse box under the hood, that operates the compressor clutch. You might just want to get a new one and try that, since they're usually not expensive, and there's no easy way for most of us to check them.

    Also - Low freon will cause the low-pressure switch to keep the compressor from engaging. Was it cooling the last time you used it? has it been slow to cool down the car? You might need more refrigerant.
    If someone blows up a school with a bomb they go after the bomber ... if someone shoots up a school they go after the gun.

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    2011 Infiniti M56, 30% ceramic tint, hard-wired Escort 8500 X50, LED cabin and trunk lighting - traded!


  3. #3
    Quote Originally Posted by Mike_TX View Post
    First thing I'd look at is the fuse(s). Check your manual for the fuse locations and the circuits they protect. Anything relating to A/C should be checked to make sure the fuse hasn't blown. With any luck it's something as simple as that.

    There is also a relay, usually in the fuse box under the hood, that operates the compressor clutch. You might just want to get a new one and try that, since they're usually not expensive, and there's no easy way for most of us to check them.

    Also - Low freon will cause the low-pressure switch to keep the compressor from engaging. Was it cooling the last time you used it? has it been slow to cool down the car? You might need more refrigerant.
    I looked at the fuse box under the hood by the battery but did not see AC listed on the fuse box cover. Nor did I see anything in the interior fuse box?

  4. #4
    I don't know what your fuse map looks like, but if there's nothing in the interior box listed as A/C, you may have only the relay, which will be in the under-hood box. It may not be labeled on the fuse box cover, although that would surprise me. You might try finding a wiring diagram online, but otherwise if you don't know which one it is, you may have to have it checked out at the dealer or at a garage.

    Bottom line is the most likely causes are, in order of probability:

    1. Bad fuse or relay
    2. Low refrigerant
    3. Bad compressor clutch

    You're going to have to have a pro do 2. or 3. anyway, so if you can't check fuses or relays, it looks like there's a trip to a garage in your future. Sorry!
    If someone blows up a school with a bomb they go after the bomber ... if someone shoots up a school they go after the gun.

    A privilege is just a right that has been taken away by government.

    Political correctness is cowardice wrapped in a lie.
    ________________________________

    2013 Acura RDX Tech, 30% tints, hardwired Escort 8500 X50

    2011 Infiniti M56, 30% ceramic tint, hard-wired Escort 8500 X50, LED cabin and trunk lighting - traded!


  5. #5
    Quote Originally Posted by Riley View Post
    My Ac compressor doesn't seem to turn on. Fan is running but no compressor. Ideas?

    Thanks
    I'm not sure the fan matters. When you turn on the ac with the hood up the compressor clutch should activate. Then the AC will run. If the clutch engages the system is low on juice or your compressor isn't pumping the juice appropriately. Otherwise electrical. I would be going to a garage. There is just too many issues to deal with. MikeTX isn't wrong but your problem is not a user fix easily. I'm a licensed HVAC guy from a time ago but after the basics I wouldn't touch it myself.

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