Running Hot
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Cadillac STS-V Series Forum Discussion, Running Hot in Cadillac V-Series Forums; Driving low speed the other day with a/c on i get the dreaded "engine hot a/c off". Well the engine ...
  1. #1
    cmross97's Avatar
    cmross97 is offline Cadillac Owners Fanatic
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    Running Hot

    Driving low speed the other day with a/c on i get the dreaded "engine hot a/c off". Well the engine actually was hot the gauge ws almost pinned. Pulled over let it cool down then I was on my way no problems. Now 2 weeks later I had the car idling in 100* weather with a/c on and i noticed the gauge climbing and climbing. I turned off the a/c for a min and shut the car off for less than a min and the temp dropped back to about normal drove off no problems. Anyone have this problem ever? or anything similar?

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  3. #2
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Running Hot

    There's virtually no way the car could cool down from over heating to normal in a minute or two. Are you sure it was actually hot?

  4. #3
    cmross97's Avatar
    cmross97 is offline Cadillac Owners Fanatic
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    Quote Originally Posted by TimmyC
    There's virtually no way the car could cool down from over heating to normal in a minute or two. Are you sure it was actually hot?
    The first time it happened it took a good ten minutes to cool off with the temp gauge gradually coming down this second time I noticed it and didn't let it get as hot so it cooled off faster. I'm due for an oil change do I'm gonna do that and change the thermostat tomorrow...last fall I was getting the engine hot ac off message with the coolant gauge at 0....so maybe the tstat is my answer to both problems. If not maybe I need to look into the cooling fans operation

  5. #4
    Zzapp's Avatar
    Zzapp is offline Cadillac Owners Fanatic
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    Re: Running Hot

    Could you hear or did you ck to see if the cooling fans were running when you got the engine hot sig?

  6. #5
    Zzapp's Avatar
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    Re: Running Hot

    I forgot to ask were you moving when it overheated, were you at freeway speeds or stuck in stopped traffic? what was outside temp at the time?

  7. #6
    cmross97's Avatar
    cmross97 is offline Cadillac Owners Fanatic
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    Quote Originally Posted by Zzapp
    I forgot to ask were you moving when it overheated, were you at freeway speeds or stuck in stopped traffic? what was outside temp at the time?
    First time it was prob like 85-90 out and I was moving but not highway speed second time it was 100 and car was idling

  8. #7
    Zzapp's Avatar
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    Re: Running Hot

    Let it idle until the fans come on, then ck if both upper and lower fans are running....

  9. #8
    Zzapp's Avatar
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    Re: Running Hot

    I got my car in Jan this year, I noticed while doing some upgrades one of my fans is newer than the other... carfax shows it was in dealer for cooling/overheating repair.. could have been simular problem...

  10. #9
    silver sts-v is offline Cadillac Owners Member
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    Re: Running Hot

    I agree with Timmy: there is no way the car can cool at all in a few minutes. To be direct, if you shut off and if it IS truly hot the unit will get hotter for the first several minutes or possibly longer. We experience this at the track and, when pitted, we leave the pump and fan(s) on while we spray the radiator to help cool off a hot engine.

    I know nothing of the electronics in newer cars. I do know when they work they are great and when they have a hiccup they stink. If your car cooled as quickly as it did the first time I suggest the problem is not in the cooling system rather in the electronics.

    But what do I know?

  11. #10
    cmross97's Avatar
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    Re: Running Hot

    with engine hot car running a/c on ony the loer fan is running, when i shut the car off both fans run but it sounds like they are at low speed, should both fans run engine hot a/c on?

  12. #11
    STS LC3's Avatar
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    Re: Running Hot

    As mentioned above, make sure the fans are working. While you're in there changing the Tstat, I'd change the coolant temp sensor(s) too. If the fans are running and that doesn't bring it in line, then it could be the water pump or restricted radiator. How many miles are on the car? Did you perform coolant changes per the maintenance schedule? Any visible coolant leaks/overflow? 100 degree weather and stop & go traffic is going to raise the coolant temp. We look at 95 degrees everyday here and my coolant gauge doesn't go over 1/2 way and the high temp for my engine oil was 207 degrees.

  13. #12
    cmross97's Avatar
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    Re: Running Hot

    Should both fans be running when engine is up to temp and the a/c is on? Cause on mine on ly the left lower fan is running on high

  14. #13
    cmross97's Avatar
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    Re: Running Hot

    Found a blown fuse for the high speed fan gonna replace and see what happens hopefully it wont pop again

  15. #14
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    Re: Running Hot

    I would think that under those 100 degree conditions that both fans would be running on high speed. When I get home from work and pull in the drive, the fans are the loudest thing on the exterior of the car. My wife said it sounds like an airplane. I'd keep an eye on the fuses. A failing (or failed) fan motor will draw high amperage and blow fuses. Might have to replace the fan(s). Good luck.

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