cluster message: ENGINE HOT - AC OFF
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Cadillac STS-V Series Forum Discussion, cluster message: ENGINE HOT - AC OFF in Cadillac V-Series Forums; got a wierd message today. I was driving in the snow, 8 degree michigan weather. After 10 minutes of driving, ...
  1. #1
    bjherron123 is offline Cadillac Owners Member
    Automobile(s): 07 STS-V
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    cluster message: ENGINE HOT - AC OFF

    got a wierd message today. I was driving in the snow, 8 degree michigan weather. After 10 minutes of driving, and 4 minutes from home, the cluster said ENGINE HOT - AC off. It then disabled my AC. I tried to turn it on just to see, and it wouldn't come on. At the same time, my temp gauge needle stopped working and went to the cold side.

    I used the dash to determine that engine oil temp was 158 and not rising. Trans temp was 98, so I kept driving (did I mention it was snowing). Got home, and did notice the cooling fans running on full as I pulled in the garage.

    anyone have this happen? still covered under the CPO, but this may be hard for them to reproduce.

    Brian

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  3. #2
    carter's_sts is offline Cadillac Owners Connoisseur
    Automobile(s): 06 STS-V & 06 STS 4
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    From reading on here, that message can mean overheating (not in your case) or it means the coolant temperature did not get up to a certain value in a certain amount of time (stupid).

    Usually its the thermostat, but with your temp gage going to the bottom, it might be the coolant temp sending unit.

  4. #3
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
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    Re: cluster message: ENGINE HOT - AC OFF

    Yes, a lot of us have had this happen. It's the Thermostat.

  5. #4
    Fierofiend is offline Cadillac Owners Fanatic
    Automobile(s): 2008 STS-V
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    Re: cluster message: ENGINE HOT - AC OFF

    Coolant temp gauge always goes to zero when this happens. Do a search, this has happened to almost all of us,lol. Its as he said, not getting up to temp,usually a thermostat. The computer really needs a software update to fix this issue, Cadillac should have realized this by now.

  6. #5
    Berger 93 is offline Cadillac Owners Fanatic
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    Re: cluster message: ENGINE HOT - AC OFF

    Still contending with this . . weather went south and have not had a chance to get the car out . . . and now the battery died . . buh . .

  7. #6
    carter's_sts is offline Cadillac Owners Connoisseur
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    Battery tender. I plug mine in usually for the whole week, since its mostly a weekend car.

  8. #7
    YoungBlood_STSV is offline Cadillac Owners Fanatic
    Automobile(s): 2006 STS-V
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    Re: cluster message: ENGINE HOT - AC OFF

    In 8 degree weather I would let it slide this time. If it does it multiple times as the weather warms up you need a new t-stat. Simple Fix.

  9. #8
    brbevil is offline Cadillac Owners Member
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    Re: cluster message: ENGINE HOT - AC OFF

    Just happened to me last month. Easy fix. Be sure to take your existing thermostat to the parts store. Advance auto parts had two listed. Unfortunately the one I bought was too big. Second time worked perfectly. Took me about 4 hours. I am a complete novice and spent lots of time looking around checking other things out. Good luck. Oh FYI. Thermostat was 15$ if I remember correctly but had to get new gasket from dealer. It was 8 dollars.

  10. #9
    terrydactul is offline Cadillac Owners Member
    Automobile(s): Sts V
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    Re: cluster message: ENGINE HOT - AC OFF

    I had the same thing a few weeks, took it to the dealer under warranty..they replaced the Thermostat and problem solved.

  11. #10
    tino160 is offline Cadillac Owners Member
    Automobile(s): 06 sts v
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    Re: cluster message: ENGINE HOT - AC OFF

    Mine started this today. Showed the messaage and temp gauge stays on cold the whole time as soon as i start it up. I am guessing it's the temp sensor and not the thermostat since it does it as soon as it starts. Am I rite?

  12. #11
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
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    Re: cluster message: ENGINE HOT - AC OFF

    No. Thermostat.

  13. #12
    tino160 is offline Cadillac Owners Member
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    Re: cluster message: ENGINE HOT - AC OFF

    Thanks, I will pick one up.

  14. #13
    rwwrrr is offline Cadillac Owners Member
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    Mine has done this for a week now. Last time it just went away. Guess I am off to auto parts store.

  15. #14
    JeffB13 is offline Cadillac Owners Member
    Automobile(s): 2007 STS-V
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    Re: cluster message: ENGINE HOT - AC OFF

    Yup, Thermostat. Happened to me last summer in the middle of a 2 hr trip.

  16. #15
    theotherguyssn's Avatar
    theotherguyssn is offline Cadillac Owners Fanatic
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    Re: cluster message: ENGINE HOT - AC OFF

    there is also a update for the engine control module for it setting a p0128 intermittantly. coolant not getting to operating temp, mine did it right after i bought it put the install in as well as a thermostat just to be safe

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