Engine HOT - A/C off on 2006 STS-V
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Cadillac STS-V Series Forum Discussion, Engine HOT - A/C off on 2006 STS-V in Cadillac V-Series Forums; I have now had the car in twice to no avail to get this fixed. First time they said they ...
  1. #1
    10056753 is offline Cadillac Owners Member
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    Engine HOT - A/C off on 2006 STS-V

    I have now had the car in twice to no avail to get this fixed. First time they said they had to "download new s/w". Latest time they "topped off supercharger coolant". Same problem remains. Warning comes on at intermittant times and the temp gauge always goes to zero when it goes on. Can happen when I first start in the morning or when i am in the middle of a drive. Oil temp is never over 185 regardless of whether the warning is showing up or not. Then unexpectantly it goes back off and the temp gauge starts reading correctly again. I have told the dealer it seems like a temp sensor problem...but they don't seem to listen.

    Any suggestions? Any tech bulletins on this one?

    Thanks

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  3. #2
    joex1 is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    Your thermostat is bad. There is a TSB on it I believe.

  4. #3
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
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    Re: Engine HOT - A/C off on 2006 STS-V

    Look through the threads. This has come up before. The post was something like $600 to change the thermostat.

    If you are out of warranty you can change it yourself in about 30-45 minutes.

    180* (Stock) replacement is a Mr. Gasket 6368
    160* (Modified) replacement is a Mr. Gasket 6367

    Several of us on the forum have the 160*.

  5. #4
    jerrylsantos is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    I had the same problem, and finally got around to replacing the thermostat with a Delco one this past weekend. As far as I can tell, i haven't gotten the Engine Hot error in similar conditions that used to trigger it.

    Oil temps are a bit different for me after I swapped the part out:
    Before the change i would rarely get above 195. With the replacement, the temps rise faster, and average temp is around 195-210 (had it get up to almost 220). The weather here has been bouncing around 100 since i changed it out, so that might be a factor.

    Are my numbers still within a safe range?

  6. #5
    Xtreme70SS is offline Cadillac Owners Fanatic
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    Re: Engine HOT - A/C off on 2006 STS-V

    Quote Originally Posted by jerrylsantos View Post
    I had the same problem, and finally got around to replacing the thermostat with a Delco one this past weekend. As far as I can tell, i haven't gotten the Engine Hot error in similar conditions that used to trigger it.

    Oil temps are a bit different for me after I swapped the part out:
    Before the change i would rarely get above 195. With the replacement, the temps rise faster, and average temp is around 195-210 (had it get up to almost 220). The weather here has been bouncing around 100 since i changed it out, so that might be a factor.

    Are my numbers still within a safe range?
    I had done separate checks on "normal" oil temps before, and found your current oil temps to be the norm. I'd be interested in if you had a 160 in there before if that's what kept the oil temp down a bit.

  7. #6
    jedhead is offline Cadillac Owners Enthusiast
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    Re: Engine HOT - A/C off on 2006 STS-V

    I had this same issue. First the PCM was reflashed to the latest version. Second time thermostat replaced. The problem has not reappeared.

    Bob

  8. #7
    kbf250 is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    I had mine at the dealer four times for this problem. Finally on the last visit they replaced the thermostat.
    No problems since.

    Kirk

  9. #8
    jerrylsantos is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    Quote Originally Posted by Xtreme70SS View Post
    I had done separate checks on "normal" oil temps before, and found your current oil temps to be the norm. I'd be interested in if you had a 160 in there before if that's what kept the oil temp down a bit.
    No clue what type of thermostat was in there prior to me changing it. I got the car at the beginning of the year, and there were dealership records that seemed to be current to the date i was shopping for it. Nothing indicated replacement/service of the thermostat.

    It could be in my head, but the engine seems to be running more comfortably around 190-200? wishful thinking maybe.

  10. #9
    AnthonyS is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    Mine is doing this now, it kicks the front fan on full blast and shuts the a/c off. I wish this wasent happening with 110° weather... I'm going to have to look up how to change the thermostat within the next few days because this is annoying. Your not alone on this.

  11. #10
    jerrylsantos is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    Straight forward replacement job...just a tight area to work in.
    Taking out the intake would provide more clearance. I lost a little bit of fluid, so had to top it off to full when i was done.

  12. #11
    AnthonyS is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    When the thermostat has been replaced are there any system resets that have to be done to clear any error code?

  13. #12
    fast_lane10 is offline Cadillac Owners Fanatic
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    Re: Engine HOT - A/C off on 2006 STS-V

    Engine oil temps on my car run around the same (190-210 range) , max i have seen is 217 with 85 degree outside and it was stop and go traffic. I am also curious to know what is the limit where I should be concerned.

  14. #13
    Xtreme70SS is offline Cadillac Owners Fanatic
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    Re: Engine HOT - A/C off on 2006 STS-V

    My understanding (and I just checked on Mobil's website to verify) is that 250 is a limit for conventional oil to begin breaking down. Synthetic oil limit increases to above 300° - which, I think, is where the sensor kicks in and warns you to idle the car until it cools down.

    Here's one link to part of Mobil's site where they discuss high-temp operation: http://www.mobiloil.com/USA-English/...ollection.aspx

    Note there's a ton of info there, hard to find specifics - but there appear to be a lot of cars that see "normal" high oil temps of 230-240°. Mobil recommends 0-40 Synthetic for those applications, but they note that's also what the vehicle manufacturer states to use in those cars.

  15. #14
    YoungBlood_STSV is offline Cadillac Owners Fanatic
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    Re: Engine HOT - A/C off on 2006 STS-V

    I've beat on the car in 95* temps and had the oil at 230. You'd need to be on a racetrack to get it any higher. Consensus is 300* and its time to shut it down. But you'll feel heatsoak wayyyy before then.

  16. #15
    Caddi STSV111 is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    Quote Originally Posted by 10056753 View Post
    I have now had the car in twice to no avail to get this fixed. First time they said they had to "download new s/w". Latest time they "topped off supercharger coolant". Same problem remains. Warning comes on at intermittant times and the temp gauge always goes to zero when it goes on. Can happen when I first start in the morning or when i am in the middle of a drive. Oil temp is never over 185 regardless of whether the warning is showing up or not. Then unexpectantly it goes back off and the temp gauge starts reading correctly again. I have told the dealer it seems like a temp sensor problem...but they don't seem to listen.

    Any suggestions? Any tech bulletins on this one?

    Thanks
    I also have a 2006 STS-V and had this same experience. I went through a lot of trial and error with the dealer but the tech is very meticulous and finally rooted it out. The problem to turned out to be a bad thermostat; the challenge was that I had just had a host of preventive maintenance done, belts hoses etc including the thermostat. It turns out the replacement thermostat was bad. A quick fix for this short term and it will last for a brief while is to disconnect the Red terminal on the battery for 30 seconds and reconnect. Keep the key fob handy and hit the door lock button if the alarm goes off. This was probably one of the most challenging issues I have encountered with the car. Hope this helps

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