No Heat
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Cadillac STS-V Series Forum Discussion, No Heat in Cadillac V-Series Forums; ...
  1. #1
    choigilligan is offline Cadillac Owners Fanatic
    Automobile(s): STS-V
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    No Heat

    My car is not blowing hot air even on 90° Anyone experienced this before

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  3. #2
    todrules is offline Cadillac Owners Fanatic
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    Re: No Heat

    I'm assuming the blower is working? Could be thermostat. Could also be an actuator in the climate control, like a blend door or something along those lines. Hopefully it's not your heater core, typically when those fail you'll smell antifreeze in the cabin. Air in the coolant system, or it could be the actual climate control unit. A lot of variables to check.

  4. #3
    Guy.Seminerio is offline Cadillac Owners Connoisseur
    Automobile(s): 2009 STS-V; 1979 Coupe Deville
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    Re: No Heat

    Choigilligan how many miles?

  5. #4
    choigilligan is offline Cadillac Owners Fanatic
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    67,000 miles 2007. I didn't smell anything. It seems like it doesn't know the temp because it gets warm if I turn it on and off and mess around w temp settings.

  6. #5
    todrules is offline Cadillac Owners Fanatic
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    Re: No Heat

    There should be an ambient temp sensor in the cabin. If that is not reading properly that could also be a possible culprit.

  7. #6
    choigilligan is offline Cadillac Owners Fanatic
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    @todrules that must be it. Where is that located. Difficult fix?

  8. #7
    todrules is offline Cadillac Owners Fanatic
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    Re: No Heat

    I think it's in the dash near the start button.126041385.gif

  9. #8
    todrules is offline Cadillac Owners Fanatic
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    Re: No Heat

    Here's the part number 15826773. Looks like list price is just over 5 dollars. Doesn't look like a hard fix. The labor time for this job is stating .4 hour.

  10. #9
    choigilligan is offline Cadillac Owners Fanatic
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    @todrules does actually rule!

  11. #10
    todrules is offline Cadillac Owners Fanatic
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    Re: No Heat

    Quote Originally Posted by choigilligan View Post
    @todrules does actually rule!
    If I could get own car fixed I might believe that!
    Guy.Seminerio likes this.

  12. #11
    choigilligan is offline Cadillac Owners Fanatic
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    So I've noticed that my fan is running after I drive the car. Which it usually wouldn't do in this weather. Massachusetts. And the container under the good up near the drivers side windshield is empty. Am I out of coolant or something.

  13. #12
    CMNTMXR57 is offline Cadillac Owners Enthusiast
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    Re: No Heat

    Uh yea.

    Seriously though, if you don't have any/enough coolant, then it can't pass to the heater core, which then can't blow heat into the cabin.

    My guess is that it is just low, otherwise you would've overheated by now. What does your temp gauge say? Then the next question is, where did it go? If it is a proper mixture of Dexcool, it should'nt evaporate, especially in a properly sealed and pressurized system. But if not, and/or if there is a leak in the system, it could be leaking out or evaporating. If it isn't leaking it, the only other place it can go... into the engine. What does your oil look like?

  14. #13
    choigilligan is offline Cadillac Owners Fanatic
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    Oil looks good, I can't even see any coolant in the coolant surge tank. The water temp is normal and the oil temp is 200. It all seems normal. I must have a leak somewhere.

    Question. I don't have any Dex-Cool can I use regular 50/50 anti freeze or is that a no no.

  15. #14
    carter's_sts is online now Cadillac Owners Connoisseur
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    Use Dex Cool unless it's been flushed and replaced with the green stuff already.

    You can buy 50% pre-mixed Dex Cool at most auto parts stores.

    If you have a leak you should be able to smell it sometimes. When I've had even a tiny leak I've smelled it and my nose doesn't work that well.

  16. #15
    STS LC3's Avatar
    STS LC3 is offline Cadillac Owners Member
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    Re: No Heat

    The plastic recovery tank (container under the good up near the driver's side windshield) has a tendency to crack and leak. I'd check that first. If that's not, pressure check the system.

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