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Thread: Engine hot ac off

  1. #1
    gruvent is offline Cadillac Owners Member
    Automobile(s): 2006 CTS-V
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    Engine hot ac off

    Engine hot ac off error message on DIC. Comes up as soon as the car starts ( even if the car is cold). Temperature gauge reads nothing, and digital temperature reads - - -

    From what I read on here it could be:
    1) thermostat 2) sending unit 3) reset computer.
    Where should I start?

  2. #2
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: Engine hot ac off

    Quote Originally Posted by gruvent View Post
    Engine hot ac off error message on DIC. Comes up as soon as the car starts ( even if the car is cold). Temperature gauge reads nothing, and digital temperature reads - - -

    From what I read on here it could be:
    1) thermostat 2) sending unit 3) reset computer.
    Where should I start?
    3-2-1

    Resetting the computer is free - disconnect battery for 30 minutes.

    Sending unit is the most likely - they don't cost much. GM Part Number 15326388

    Thermostat is unlikely since it is not in play when you start the car.

    It also could be oxidation on Ground 101, or other grounds in the engine compartment - see attached.
    Last edited by darkman; 03-09-13 at 12:08 PM.

  3. #3
    gruvent is offline Cadillac Owners Member
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    Re: Engine hot ac off

    Thanks darkman, that makes sense. By chance do you know where the sending unit is on the LS2? (2006)

  4. #4
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: Engine hot ac off

    Quote Originally Posted by gruvent View Post
    Thanks darkman, that makes sense. By chance do you know where the sending unit is on the LS2? (2006)
    I don't know with certainty. I assume that it is located on the driver's side cylinder head at the front. The LS2 and the LS6 have the same cylinder heads.

    Supplement: Rock Auto shows the part number for the LS2 and LS6.

  5. #5
    pato is offline Cadillac Owners Fanatic
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    Re: Engine hot ac off

    ^^ That is correct. The coolant sensor is next to the exhaust port for cylinder 1 (driver's side head).

  6. #6
    gruvent is offline Cadillac Owners Member
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    Re: Engine hot ac off

    For the record, The Computer reset did not work, came back on shortly after the reset.

    However,I did unplug the sensor wire (at the sensor) and plugged it back it and the problem went away. So it's possible that the contacts just need to be cleaned.

    Thanks!


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