Restart For Heat
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Restart For Heat in Past Cadillac Vehicle Discussion; I have a heating problem that I was unable to find in the threads, maybe somebody has a solution. I ...
  1. #1
    BatCaddy's Avatar
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    Question Restart For Heat

    I have a heating problem that I was unable to find in the threads, maybe somebody has a solution. I have a 1999 Seville STS with 111,000 miles that I bought about 10 months ago, after it had been mostly sitting for about six years. The problem: After the initial startup and the engine warms, I have no heat until I shut down and then restart the engine. The AC works normally, but no combination of the temperature controls will generate any hot air until I restart. I have already replaced the radiator, thermostat and coolant and recharged the AC but the problem predates those actions. The purge line is clear and flows freely and there are no DTC or OBD II codes. The ambient air temperature sensor seems to be working correctly.
    In summary: Start engine, reach operating temperature, AC but no heat, restart engine, great heat. Any assistance will be appreciated. Thanks!

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Restart For Heat

    Almost sounds like an actuator, but that should set a DTC.

    Are the heater hoses both hot at the firewall?

  4. #3
    apachedawg is offline Cadillac Owners Member
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    When my actuator went bad it never set off a DTC. Check the blend door actuator.

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    BatCaddy's Avatar
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    Re: Restart For Heat

    Quote Originally Posted by Ranger View Post
    Almost sounds like an actuator, but that should set a DTC.

    Are the heater hoses both hot at the firewall?
    Yes, the heater hoses are hot. After restarting the engine, I have good heat and can switch to AC but cannot go back to heat without another restart. How can I check or observe the action of the Heat/AC blend door? Thanks.

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    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Restart For Heat

    This is a far-out long shot, but have you gone into the DIC and fooled with the Personalization settings ? (Owner's manual chapter) There's a ton of stuff you can do to set the HVAC to your "personal" preferences .......... maybe, just maybe ............

    Does your system have an ON/ECON mode ?? Just fishing for ideas ............

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    BatCaddy's Avatar
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    Re: Restart For Heat

    Quote Originally Posted by Submariner409 View Post
    This is a far-out long shot, but have you gone into the DIC and fooled with the Personalization settings ? (Owner's manual chapter) There's a ton of stuff you can do to set the HVAC to your "personal" preferences .......... maybe, just maybe ............

    Does your system have an ON/ECON mode ?? Just fishing for ideas ............
    Good idea, Submariner, I will go through the DIC settings after work today.

  8. #7
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    There are no HVAC personalization settings in the DIC menu, but HVAC settings are recalled when you press the driver 1 or 2 buttons. However, it should recall whatever the settings were last set, without having to actually press the set button.

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    Re: Restart For Heat

    Today after work I drove the car and learned a bit more. If I start the car with the AC compressor turned off, I get heat without restarting the engine. I can take the temperature control down to 60 degrees, get ambient air (no AC) and take it back up to 90 with good heat. If I engage the AC compressor at any time while driving, I still have heat until I lower the temperature then no more heat, only AC. Fortunately, the car remembers the previous HVAC settings when the engine is shut down. Is there any way to visually observe the operation of the Heat/AC blend door? I took out the glove box but did not see anything obvious. Thanks.

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    Ranger's Avatar
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    Re: Restart For Heat

    I think you can see one actuator through the glove box and the other from beneath.

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