Question about 1999 Jeep Grand Cherokee

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Removing or opening the blend air doors!

If I remove or leave the blend air doors in the open position will it work to have heat for now or would it make things worser??? Can't afford the kit right now to have it replaced...

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I went to heatertreater.net and it gave me detailed instruction on how to replace the blend air door but I couldnt afford to buy the kit. So for now I placed a long screw in between in the doors and it works. Wouldnt suggest doing it but it will work until you can replace it!!!

Posted on Nov 26, 2008

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How come I get hot air from my cars vents when I turn the air conditioner on.


Reeeeeeeeeeally common problem on that vehicle is that the heater blend door gets stuck in position. It's a little hard to get to, and you will need to remove the glove compartment to reach it, but often the blend door gets stuck in the "heat" position and needs to be lubricated and coaxed to move.
Also, vacuum leaks will cause the heater blend door to fail to move. Most common culprit: The automatic brake release vacuum line has broken or fallen off. Do you hear a hissing sound from under the dash? FIND IT AND FIX IT :)

Jun 23, 2014 | 2003 Mercury Grand Marquis

2 Answers

Heater blows only 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.

Dec 27, 2012 | 1999 GMC Sierra

1 Answer

Heater does not work, doors open ok but no heat


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.

Nov 08, 2012 | 1995 Lincoln Town Car

2 Answers

NO HEAT STUCK ON AC HEAR CLICKING IN CENTER CONSOLE


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.

Nov 05, 2012 | Cars & Trucks

1 Answer

02 navigator front heater blows cold air


Sounds like the blend door or blend motor is not functioning/opening. This door allows the heat/cold air to come in by adjusting open, closed or anywhere in-between for temp. Start there. They are usually vacuum controlled and mounted under the front dashboard near the knee board.

Nov 09, 2011 | 2002 Lincoln Navigator

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

1 Answer

Last week I ran the air conditioning unit in my 2006 Pontiac Torrent, when I got home the weather had turned cold so I put it back on the heat, however, the heater does not work now, all it does is blow...


Hello first of all

Your blend door motor / acuator is bad its basiclly a door that opens and closes when you flip your
heat to ac dial to either allow the hot air through the vents or cold air.

That being said on some suv and cars and trucks you can replace the motor that controlls this blend door can be changed without removing the dash and some you haveto remove the dash.


The blend door is located right by the heater core in the dash but sometimes the motor that controlls the door blend door is accsesable without dash removal and sometimes it is. I posted a picture below of what part is bad i hope it helps you.

If it helps please leave me 4 thumbs up thanks

jamiesturm29_5.jpg

May 17, 2011 | 2006 Pontiac Torrent

1 Answer

My blazer's heat will not shut off. The temp control is in the "cold" position but it continually blows hot air after the vehicle warms up.


i think the blend door is open maybe the blend door motor is out in open position, or the blower blend door is broken. or heater-a/c control valve is faulty. Thanks

Mar 28, 2011 | Chevrolet S 10 Cars & Trucks

3 Answers

94 Toyota Camry-No Heat!


yes. it could be the switch, or it could be the blender door that is stuck.

May 15, 2010 | 1994 Toyota Camry

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