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

  1. #16
    conedoctor is offline Cadillac Owners Connoisseur
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    Re: ac off light is on...cant get it to turn off

    So once one of the boxes looses a ground and assume it gets the ground again does it take a key cycle or does the box that lost it keep looking at a set sample rate?


  2. #17
    glake89's Avatar
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    Re: ac off light is on...cant get it to turn off

    A DTC will set when a condition exists for 1 to 5 seconds, depending on what it is. If it doesn't reoccur in 2 or more drive cycles the MIL will go off but the DTC remains in history as well as freeze frame. I think once a connection begins to fail it's not likely to permanently repair itself although it may be OK for extended periods.
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  3. #18
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    ok guys...i will check the connections as mentioned above. But its hot am humid with rain today and the ac stopped working again. it will be cold again this weekend, but i have a feeling when the temp drops the ac will start up again

  4. #19
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    Re: ac off light is on...cant get it to turn off

    See if you can get the freeze frame records for the codes you found. Might lead us to a solution.
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  5. #20
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    i will get the freeze frame next time i go to the parts store.

    like clockwork...outside temp goes down, everything works fine...temp gets around 70-80, it stops working.

  6. #21
    glake89's Avatar
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    Re: ac off light is on...cant get it to turn off

    Found this in SM-

    "The A/C refrigerant pressure sensor prevents the A/C system from operating when an excessively high or low pressure condition exists.

    If the ECM detects a failure in the A/C refrigerant pressure sensor or circuit, the GMLAN message sent to the HVAC control module will be invalid. The HVAC control module will then send a request to the radio for display of the SERVICE A/C SYSTEM that will be displayed on the DIC. The HVAC control module will also display A/C OFF on the module as long as the condition is present."
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  7. #22
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    where is that sensor?

  8. #23
    glake89's Avatar
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    Re: ac off light is on...cant get it to turn off

    You get to it by removing the front air deflector so it's down near the bottom of the radiator, but you have to discharge the system to replace it. The sensor may/may not be bad. The refrigerant charge may be just borderline so the ambient temp. would cause enough of a pressure change to trigger a fault. Go to an auto AC shop and have them check. Don't let them talk you into a discharge/recharge, just bring the system into spec.
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  9. #24
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    according to the gauge on the recharge bottle i bought, the system is full, but i am not sure how accurate that is.

  10. #25
    glake89's Avatar
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    Re: ac off light is on...cant get it to turn off

    Here ar the pressures you're looking for, at ambient temp. (shown)-
    Above 16C (60F) 345 kPa (50 psi)

    Above 24C (75F) 483 kPa (70 psi)

    Above 33C (90F) 690 kPa (100 psi)

    See how much the pressure changes (static pressure) with 15 deg. ambient? Sounds to me like you have too much freon in system.

    edit. note you should only add freon when system is running.
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  11. #26
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    i thought the same about too much pressure. i am going to switch out cars with the wife and get this thing in my shop this week. i will keep you guys posted. thanks for all the info

  12. #27
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    i finally got the code on the scanner p0532 pressure sensor. the parts store does not offer this. I guess the dealer is my only option??? about how much should i expect?

  13. #28
    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
    i finally got the code on the scanner p0532 pressure sensor. the parts store does not offer this. I guess the dealer is my only option??? about how much should i expect?
    You need to independently verify this is the correct part for you SRX. Per Amazon's fitment it's correct for my 07 (but they've been wrong before)
    http://www.amazon.com/ACDelco-15-501...ywords=1550153
    Also as glake pointed out the system must be discharged to replace this item.

  14. #29
    glake89's Avatar
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    Re: ac off light is on...cant get it to turn off

    0532 does not necessarily mean the sensor is bad, it also means pressure is low. Have an AC shop check first!
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  15. #30
    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
    0532 does not necessarily mean the sensor is bad, it also means pressure is low. Have an AC shop check first!
    its definitely not low. at least from what i can tell on my gauge. But i will keep you posted.

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