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Thread: A/C troubles

  1. #1
    Junior Member
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    Oct 2019
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    Saudi Arabia
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    Cadillac XLR

    2007 Raven Black XLR-V

    Default A/C troubles

    So happy with everyone's input on the forum, thanks fellas. Figured I run this through you guys as well, as it has me scratching my head. Any help would be so much appreciated. It gets to 47 degrees Celsius over here and it really is a Sauna with a Supercharger on it.

    Here's the situation:
    The outside temperature sensor is not giving a correct reading. So I replaced part #10248414, which was the ambient air temperature sensor located next to the horns on the left side in front of the radiator. The sensor still gave erratic readings.
    I am looking on the touch screen, and see it pointing to 24C, which is far from the truth since it's +40C outside.

    I kick on the A/C and set it to 16C, go about my way and watch the outside temp readings. Since it seems like the compressor will only kick in if it's really hot outside, so there's a calculation happening there based on the readings of this ambient air sensor.
    When it's reading +30C outside, the compressor kicks in and I get nice cool air. But the sensor might suddenly drop and read NEGATIVE 40C! (-40C) so the "ICE POSSIBLE" warning appears on the dash. Basically start getting very hot air from the vents, even though I have A/C on with temp set to 16C. My assumption is it's referencing the outside air temp and trying to regulate cabin temp UP to 16C, therefore shutting off the compressor and blasting hot air.


    Ok, since the sensor itself was not the issue, I threw on the Tech2 and found the following issues.
    A/C troubles-screen-shot-2020-06-19-at-12-35-29-pm-jpg


    So there's an issue with the circuit, apparently. I also realized, the two horns are on the same harness, and I think my high note horn is not working. (whichever the one is to the back is, not working). The real question is, what and how do I go about fixing this?
    I already have the front bumper and headlights off, but am not an electric guru so don't know where to start.



    ِAny pointers?

  2. #2
    Junior Member
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    Cadillac XLR

    2005 XLR

    Default

    I would trace the ground wires for the temp sensor and horn circuits all the way back to the chassis. . Probably just need to clean the spots where the grounds attach to the chassis.

    Sent from my SM-N975U using Tapatalk

  3. #3
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    Cadillac XLR

    2007 Raven Black XLR-V

    Default

    Can someone please help me narrow down ground circuits involved with the outside air temperature sensor?

    It is now constantly reading 75F, or 24C all the time!!

    Therefore not cooling when the actual outside temp is 43C!!!


    I would appreciate any input on this as I can't find where the issue is. However, still getting the B0159 error when I scan with the Tech2.

  4. #4
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    Cadillac XLR

    2007 Raven Black XLR-V

    Default

    While looking at the horn harness to make sure the 10mm bolt had clean contact to ground, I realized that my skid plate must've been hit before by the previous owner. I can see cracked joints where it is actually held to the chassis (underneath and surrounding the main radiator).
    Now the real question is, are these contact points for ground?

    A/C troubles-img_20200703_093951-jpg

    A/C troubles-inkedimg_20200703_093917_li-jpg

    This high note horn connector is loose, and will work when I move the cable. A tech looked at it and told me it was a bad horn, as these are the symptoms bad horns give, don't know if that's true.



    A/C troubles-inkedimg_20200703_093945_li-jpg

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