ac off light is on...cant get it to turn off
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Cadillac SRX First Generation Forum - 2004 - 2009 Discussion, ac off light is on...cant get it to turn off in Cadillac SRX Forums; the ac has been working fine...i was getting a service ac soon light, but was still blowing ice cold. now, ...
  1. #1
    kycycles is offline Cadillac Owners Member
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    ac off light is on...cant get it to turn off

    the ac has been working fine...i was getting a service ac soon light, but was still blowing ice cold. now, the "ac off" light is on and i cannot turn it off. I hooked the freon up to send some through the system, and nothing happened. i did not get a manual with this car, so i am going to find the fuse blocks and check that. i also have the battery unhooked right now to try to reset the system.

    any thoughts.

    i have no codes on the scanner.

    is there any way to test the compressor?

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    glake89's Avatar
    glake89 is online now Cadillac Owners Connoisseur
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    Re: ac off light is on...cant get it to turn off

    From the SM-
    The A/C switch will illuminate A/C OFF when the A/C switch is selected.
    You may have a 'B' DTC; get code read at a parts store and advise.

    Your 'reset' may work if there is a module communication problem.
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    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    Quote Originally Posted by glake89 View Post
    From the SM-

    You may have a 'B' DTC; get code read at a parts store and advise.

    Your 'reset' may work if there is a module communication problem.
    dang...so that probably means the compressor has crapped out. I have a scanner..i am not showing any codes.

    unhooking the battery did not do anything for me. i only saw one fuse in the box that had anything to do with hvac...it was fine

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    glake89's Avatar
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    Re: ac off light is on...cant get it to turn off

    Does your scanner do all 4 code types; P,B,C,U?
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    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    Quote Originally Posted by glake89 View Post
    Does your scanner do all 4 code types; P,B,C,U?
    yes, i believe it idoes. its an obdii/eobd multilingual scanner

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    Re: ac off light is on...cant get it to turn off

    If you had a 'service AC' message, you have a code, maybe in 'history'. Try a parts store for a free read.
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    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    will try that as well. the code would just pop up randomly.

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    n7don_srx is offline Cadillac Owners Enthusiast
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    Re: ac off light is on...cant get it to turn off

    If one of the servos that control the position of doors in the ac system fails it will set a "B" code also. Generally the system will still blow cold air it just won't be directed to the correct level. I'd caution about just putting refrigerant into the system without confirming it's low.
    Have you looked underhood to confirm what the compressor is doing.... running, not running?
    As a comment, most consumer grade scanners only read P (Powertrain) codes. If the system has set an error it should be stored in the ECM's history (as glake pointed out) even if the CEL isn't on.

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    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    i dont see or hear the compressor doing anything.

    the system did not take any refrigerant at all...which i assume means it was full

    also, the wife cranked the heat up this morning and the "Ac off" indicator never went away.

  11. #10
    n7don_srx is offline Cadillac Owners Enthusiast
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    Re: ac off light is on...cant get it to turn off

    Quote Originally Posted by kycycles View Post
    the system did not take any refrigerant at all...which i assume means it was full
    .
    The correct way to determine if the system is charged with the right amount is to evacuate all the refrigerant and refill with the specified amount. It's fairly easy to over-charge a system and then bad things can happen. Do you have a trusted shop to evaluate your problem?

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    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    ok, the ac started working again yesterday. We are now able to turn the ac indicator light on and off and its blowing cold as ice. I still have not had time to run diagnostics on it, but will soon

    we did have a nice drop in temperature around here ...from the high 70's to the mid 50's if it matters

  13. #12
    orandaberg is offline Cadillac Owners Connoisseur
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    Re: ac off light is on...cant get it to turn off

    Good! Let us know so if it happens to someone else it can be fixed?

  14. #13
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    today the ac was intermittent. i ran the codes and got the following

    p0120
    c0450
    b0103
    u0001

    any thoughts?

    ----------

    ok, so after some research...none of the trouble codes have anything to do with the ac? what do i do now? also...does anyone think that the outside temp change has anything to do with this issue? it was very muggy today and temps are getting close to 70 again. the ac was on and off for no apparent reason

  15. #14
    orandaberg is offline Cadillac Owners Connoisseur
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    The compressor going out?

  16. #15
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    Re: ac off light is on...cant get it to turn off

    You have shorts to voltage, to grounds or open circuits, most likely the latter as well as lost or poor ground connections. These cars are very ground dependent for the electronics to work.
    Remove, clean and reattach all ground connections you can find, esp. at the ECM. (1 of the ECM bolts is a grd. plus a redundant grd. wire).
    If that doesn't do it, remove, clean and reattach wire harness connectors at ECM and ECBM. Do this w/ neg. battery cable disconnected.
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