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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 guys are trying to lead you to water, take it to an AC shop. What does the gauge read? ...
  1. #31
    conedoctor is online now Cadillac Owners Connoisseur
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    Re: ac off light is on...cant get it to turn off

    The guys are trying to lead you to water, take it to an AC shop.

    What does the gauge read? does it have pressure or just the words full?

  2. #32
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    when i first got the car i checked it with the gauge on the coolant refill bottle. i dont remember exactly what it was, but with the temperature at the time, it was where it needed to be.

    i am not sure how to check it again without the compressor running.

  3. #33
    conedoctor is online now Cadillac Owners Connoisseur
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    Re: ac off light is on...cant get it to turn off

    did you check hi and low side?

  4. #34
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    Re: ac off light is on...cant get it to turn off

    You need a set of AC gauges or a single gauge that will read as high as the numbers I posted @25. Those are STATIC pressures (compressor not running). The throwaway gauge on the can is worth exactly the same as the empty can.
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  5. #35
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    Re: ac off light is on...cant get it to turn off

    If only there were a shop or something that just worked on AC systems, oh wait........

  6. #36
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    Re: ac off light is on...cant get it to turn off

    Quote Originally Posted by conedoctor View Post
    If only there were a shop or something that just worked on AC systems, oh wait........
    that would be no fun. cant learn unless i do it myself right?

  7. #37
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    Re: ac off light is on...cant get it to turn off

    Some things are best left to others, unless you like to spend money.
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  8. #38
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    i have never really had any problems charging an ac system or working on one on most of the cars i have had worked on over the years. i am being a little more careful on this one because there is more involved.

    however, if i get to the point were i think its too much, i will take it to the ac shop, but i am not there yet. i will go buy the gauges i need and check the high and low sides and see whats up.

  9. #39
    conedoctor is online now Cadillac Owners Connoisseur
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    Re: ac off light is on...cant get it to turn off

    Not saying you don't have the ability or able to learn but you may do more harm than good, I'm all for understanding how it all works but I don't have a problem letting trained people who have all the tools get it done right the first time.

    Do you have to add oil or was it in the coolant you used, what coolant did you use and where did the original charge go?

  10. #40
    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 a chance to hook some gauges up. the ac started working today after driving down a gravel road. I am going to check the connection at the sensor...it sounds like it may have a short.

    any way...with the compressor running, i am showing 20lbs on the low pressure side and 58 pounds on the high pressure side.

    which side do i need to go off of...its low regardless(according to the numbers posted earlier in this thread)

    ----------

    stupid question...nevermind about what side to go off of.

    ----------

    right now, the weather channel is reporting that it is 75 outside. that being said, i am down in the valley some, so i would say its probably not that hot. If i go by the numbers below, 58 pounds should be too much freon...right???

    Above 16°C (60°F) 345 kPa (50 psi)

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

    ----------

    another question...i am only supposed to add freon when the compressor is running. what do i do since its not running?

  11. #41
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    Re: ac off light is on...cant get it to turn off

    Those pressures are static (not running) and sound about right. You only add when running. Reading the SM it gives 2 quantities of freon to use (they go by weight of freon), 12-15 lbs. in one discussion and 1.26 lbs. in another. When it runs, if the air is cold it's probably OK. If not, I can't imagine an AC shop would charge too much to bring it to spec. Sounds like you're on the right track looking for poor connections. Maybe the console switch itself.

    Found the chart for running pressures.
    AC.pdf
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  12. #42
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    wow 238 psi on high side??? my gauges dont go that high..they stop at 90. it turns out the pressure switch had a loose wire....that is fixed and it seems to be running like it should. however,,,its not as cool at idle....i did let 8 psi out to bring the high side down according to the chart shown on here earlier

  13. #43
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    Re: ac off light is on...cant get it to turn off

    It looks like you have a low side gauge. A decent set of A/C gauges can usually be picked up for about $50 on ebay. They are necessary to have because a high side gauge can help indicate an overcharged condition or a bad compressor. That said, automotive A/C refrigerant pressures can vary quite a bit especially on the high side. Since you have a low side gauge, look for a low side pressure of 40 psig +/- 5 psig with the system running, of course.

    Bill

  14. #44
    kycycles is offline Cadillac Owners Member
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    Re: ac off light is on...cant get it to turn off

    i am an idiot...i was looking at the line on the gauges for 134a...i was in a hurry and completely ignored that fact that the psi reading was in the center of the gauge. it works great now....i will send a pic of my gauge reading after while.

    now its on to the rear wheel bearing, power steering leak, power steering assist an stability control issues..

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