Question about 2000 Chevrolet Silverado

3 Answers

Can't turn off heater until engine cools down

I have a 2000 Silverado Z71 5.3 L., whenever the heat is turned on you can't turn it off at all until the engine has cooled down. There is no adjustment, it's full bore all the time.

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  • tgordner Oct 15, 2008

    this is not a fuel pump issue. this problem deals with the the heat inside the truck, you can't turn it off once its turned on.

  • tgordner Oct 16, 2008

    It's not the fan speed it's the temperature control,no matter where you set it, it goes to high heat and won.t reset until the engine cools down.

  • tgordner Oct 16, 2008

    I've unhooked the battery before but doesn't seem to correct the problem or change it.

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3 Answers

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  • Chevrolet Master
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There is a part in the heating and air conditioning system called the blend door motor, this motor moves a door in the air ducts that either provides heat from the heater core or cold from the AC evaporator core, or a mix or blend of both hot and cold air, that is why it is called a blend door, the problem is the door is either stuck in the heat position or the motor that operates it has failed, this can be checked by the dealer by doing an electronic test of the systems functions, the repair is very labor intensive, since it requires removing to dash to replace the defective blend door parts.

Posted on Oct 15, 2008

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  • yadayada
    yadayada Oct 15, 2008

    I am a retired dealer technician and I have seen this issue many times, this is not a guess.

  • yadayada
    yadayada Oct 16, 2008

    I did not see until your latest post comment that the fan was on high, that changes things, the AC control head may be at fault, like I said the dealer can do an electronic test of the system to determine the exact cause, only he has the correct test equip and tech manuals to resolve this problem

  • yadayada
    yadayada Oct 16, 2008

    Continues... the blend door can still be an issue and is a common failure, changed allot of them, unless these other experts have automotive HVAC experience they are just guessing.

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  • Master
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It is most likely the fan speed selector for the heater motor
does the fan sjut off when the car is turned off?

Posted on Oct 15, 2008

  • 2 more comments 
  • jason Oct 15, 2008

    if the fan is continuuisly runnig then it has nothing to do with the door bieng opened or closed

    thses motors are controled by digital controls on the dash and that digital is stuck.

    unplugging the battery under the hood for a while might reset the digital controls , if not then they will need to be replaced because they are failing

  • jason Oct 16, 2008

    then that part of the control will need replacing.

    have you tried unhooking the battery on the car for a while?

  • jason Oct 16, 2008

    then the temperature control circut needs to be replaced

  • jason Oct 16, 2008

    it is a sensor that is causing the malfunction in the temperature control

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  • Master
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This is issue with the fuel pump.

Posted on Oct 15, 2008

  • Legin Varghese
    Legin Varghese Oct 15, 2008

    The bad coil in the fuel pump get heated and starts working improperly. In most of the cases the car wont start up until the coil is cold back again.
    you cannot repair it , the only option is to replace it.

    If you have any further querries do reply back

    Thanks for using fixya.


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2000chev1500havetoflushheatercoreevery2monstogetheat


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Remove the thermostat housing again, then remove the old water pump and install a new water pump, replace the thermostat with a new one rated at 195 degrees, and be sure to install it in the proper direction. Fill radiator with water only (you don't want to waste money on antifreeze until you are sure you have heat), leave radiator cap off, start engine and let it come to operating temperature, not less than fifteen minutes. Turn engine off, and let cool compltely. Fill radiator with water only, install radiator cap, and restart vehicle. Let come to operating temperature again, not less than fifteen minutes, turn off. Let cool completely, drain radiator again if your truck got proper heat in cabin, then refill with the proper mixture of water/antifreeze. This sounds like a lot of repetition, but this will flush your entire system, boost your water pressure, and properly regulate your engine temperature. If the problem repeats in your two month window, have the radiator professionally serviced and the heater core will probably have to be replaced.
Always use the proper type and amount of anitfreeze!

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Have you checked the coolant level? If it is low, what you describe will happen, the engine will run hot, and the heat won't seem to work (coolant level too low to circulate through the heater core). Hope it's that simple, if not, let me know and I'll attempt to help further. Good luck!

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go here for villager/quest help.

http://autos.groups.yahoo.com/group/villagerquest/

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