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My van constantly blows heat no matter what I do, even if it's turned off. Could the blend door be stuck and is there a way around that until I can get a new part?

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U need to open up the heater box and see if the flap is opening and closing fully

Posted on Apr 11, 2015

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There are two heater hoses in the engine bay that go to your heater core. The quick way is to just clamp one of them and that stops the water flow to the heater core. The safest way is to remove these hoses from the heater core and join them together so as the flow will circulate.

Posted on Apr 11, 2015

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  • Karen Goodwin
    Karen Goodwin Apr 11, 2015

    Is there a fuse I can pull to stop it from blowing for now?

  • terry stevens Apr 11, 2015

    I don't know your make and model. If the blower motor will not stop remove the blowe motor fuse. If your blower has stopped and you are still getting hot air change the vent settings from fresh to recir

  • terry stevens Apr 11, 2015

    Recirculate

  • Earl DaSquirrel
    Earl DaSquirrel Apr 11, 2015

    I addad that her problem is the blend door actuator, not a leaking heater core which your suggested answer will lead her to do more work than needed

  • terry stevens Apr 11, 2015

    She was asking for away around the actuator not working and stop heat entering the cab. Do you think that clamping one heater hose would stop a leaking heater core.

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Yea, it can be manually moved on some makes/models... I dunno about your van since you didn't say the year make model...

Google search for similar problems with the year make model & you may find others who had tackled this problem

Posted on Apr 11, 2015

  • Karen Goodwin
    Karen Goodwin Apr 11, 2015

    2000 dodge caravan and I researched a little but all answers deal with heat not working or flushing the system, but my coolant is good. All my fluids get checked regularly but this heat problem is driving me crazy. Even when I have it turned off it's still pushing out hot air.

  • Earl DaSquirrel
    Earl DaSquirrel Apr 11, 2015

    that took me less than a minute to Google the YouTube video once you told me the year make model!

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1 Answer

Passenger side blows cold air when heat is turned on


A blend door is stuck you're most likely have to remove the dashboard to fix the blend door, you'll have to look up the parts for your car and be prepared to put in a few hours of work.
Mechanics charge around $350 to $600 to fix it.

Oct 24, 2015 | 2011 Chevrolet Traverse

1 Answer

The heater kicks on but only blows cold air


Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Jan 03, 2013 | Cars & Trucks

1 Answer

My heat works great in the front but the rear vents only blow cold


The blend door actuator is located in the left rear quater panel. It's right there when you remove the trim panel (left side rear) Below is a picture of it when panel is removed along with another picture of the air duct system. I also gave you a picture of the connector at the actuator. Make sure you are geting power and test opening and closing. Worst case you could make the blend door stay to where you are geting heat until you can repair the problem...11_6_2012_12_34_03_am.jpg11_6_2012_12_34_21_am.jpg11_6_2012_12_34_35_am.jpg11_6_2012_12_34_48_am.jpg

Nov 05, 2012 | 1999 Ford Expedition

1 Answer

1998 gmc surburban. front blows 82 degrees, rear blows 48 degrees. ambient is 91 degrees. this is with max-recirc-full tilt.the valve for the heater core does not change position no matter where i put the...


Hi John,
Your right with your diagnostics, you have a blend door problem. If your switching to cool air and it is still hot then you also have a heat exchange unit fault, this is the component that changes the water flow from hot to cool by shutting off. If it is not operating correctly this will give you constant hot air no matter where you temperature switch is positioned.
As for the warm air while the engine is cold, sounds like the blend door is still open to atmosphere tempreture and if it is hot outside will pull that hot air into the inside of the vehicle.
Have the heat exchange valve checked, and the only way the check blend door operation is to remove the wiring from the blend doors and have the circuit tested. If the circuit is ok then the blend doors will need to be replaced.
Hope this helps

Jul 24, 2011 | 1998 GMC Suburban

4 Answers

NO heat in front of 2001 windstar van. Thumping


Blend air door may be stuck. I removed a pencil from a heater box before. It had fallen from the dash, down through the defrost vents and jamed the door.

Nov 13, 2009 | 2001 Ford Windstar

1 Answer

AC unit blows cold on passenger side and warm on driver side.


Hi,
There are separate blend doors for the passenger and driver's side. The blend doors divert, not block air, so it is unlikely that the blend doors are the problem. You need to check the operation of the re-circ door.
There may be some more duct work that attaches to the heat/air conditioning housing under the dash, that supplies air and or heat to both the driver side and passenger side of the car, the duct work on the driver side may have come disconnected.Check this also.
Hope this helps
Thanks
Smith.

Sep 11, 2009 | 2008 BMW 528i Sedan

2 Answers

Heat constantly blowing


I know this problem all to well as i am a Ford dealer tech, the problem is caused by either a defectice air temp control blend door actuator motor or a stuck air temp control blend door or in rare cases both, your system's door is stuck n the heater position, which is where they almost always fail.

May 14, 2009 | 1998 Mazda B-Series

1 Answer

Truck heater is stuck ON


There is a blend door motor on top of the housing. If you open the glove box, and look to the top of the housing near the left rear of the glove box, you should see the blend door motor. You can check it at this point. Also check the housing, as I have seen a number of these with a damaged or broken housing.

Nov 03, 2008 | 1997 Ford Explorer AWD

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