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Blend door check

How can i check if the blend door is bad?

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Well depending on the make model and year, you may have to disassemble part of the dash to get to it.
On newer models, the blend doors are moved by small electric motors. The motors can fail, and the doors can stick.

Posted on May 03, 2013


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Posted on Jan 02, 2017


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Kia sportage 2008 v6,I've a problem with AC,In hot weather after 30 mins drive loose conditioned air and hot air start blowing although after switching engine off for may be 20 mins; AC start working

Bad blend door actuator is your cause. You need to disconnect the actuator from the blend door and manually check the blend door. One side of the door switches the heat and one draws air from the ac evaporator.

Jun 06, 2016 | Kia Cars & Trucks

3 Answers

My heater stoped working the a\c still works and fuses are fine

Either the heater core is clogged or busted, or a blend door is broken.
YOU TUBE has a lot of videos on this subject.

Jan 28, 2016 | 1998 Ford Expedition

1 Answer

I have a Jeep Liberty and the heater only blows like warm air. I have replaced the thermostat and flushed the heater core and still no change. What could be wrong?

Blend door may be sticking thus mixing too much cold air with the hot. Bad blend door actuator, vacuum leak or blend door seal is bad.

Feb 19, 2015 | Jeep Cars & Trucks

1 Answer

No heat coming from blower, cold air only

First I would expect a bad fuse for the blend door. The blend door mixes hot and cold air for the temp. inside. check operation for the blend door by changing the mode from defrost to cabin ( lower, upper, and combination of air flow vents ).If there is no sound of the door moving, check fuses.The blend door is electrically controlled, so it is possible you may have developed a bad wire. If you don't find a bad fuse , ( and don't have the time or money for a shop) , you may be able to move the door by hand - careful though, the gears are plastic and easy to break! The lever should be over the transmission hump under the dash - sometimes they are more towards the passenger side, and you should see a plastic oval piece connecting to a small arm. it is hard to find the arm, since it will be pretty much buried in the dash.
Hope this helps!!

Jan 11, 2015 | 2003 Oldsmobile Alero

1 Answer

2001 chrysler town and country. A\C heat Blowers will not work when controlled my front main pannel. It is a auto temp controlled system. The rear blower will work but no heat when controlled by the rear...

This may be similar to what I just fixed on an '00 dodge:

Accessing the Integrated Diagnostic System:

Procedure for Automatic Temp Control (ATC) equipped vehicles:

With the engine ON and the vehicle stopped set the temp to 75*F. Next hold down the Floor, Mix and Defrost buttons until the ATC display begins to flash. While the display is flashing, the system will run it's tests and calibrations.

When the display stops flashing, the tests and calibrations are complete.

The ATC display can only display one error code at a time. Any stored codes can be scrolled through by pressing the Panel mode button once for each code. DO NOT press any other button or you will have to start the test over. Note the codes and refer to the list below to determine what system is malfunctioning.

List of Climate Control DTCs:
23: Blend door actuator feedback failure (bad servo)
24: Mode door actuator feedback failure (bad servo)
25: Ambient temp sensor failure
26: ATC In Car thermister failure (ATC only, bad ATC head or ATC head disconnected while battery is connected)
27: ATC in car sensor failure (ATC only)
31: Recirculation door actuator stalled (stuck door or bad servo)
32: Blend door actuator stall failure (stuck door or bad servo)
33: Mode door actuator stall failure (stuck door or bad servo)
34: Engine temperature message not received (ATC only, bad ATC head or bus failure)
35: Evaporator sensor failure
36: ATC control communication failure (bad ATC head or bus failure)
37: Blend door actuator output shorted to battery (bad servo or wiring fault)
38: Blend door actuator output shorted to ground (bad servo or wiring fault)
39: Mode door actuator output shorted to battery (bad servo or wiring fault)
40: Mode door actuator output shorted to ground (bad servo or wiring fault)
41: Recirculation door actuator output shorted to battery (bad servo or wiring fault)
42: Recirculation door actuator output shorted to ground (bad servo or wiring fault)
43: Common door shorted to battery (probable wiring fault, could be a servo that failed in an odd manner)
44: Common door shorted to ground (probable wiring fault, could be a servo that failed in an odd manner)
45: A/C control blend door input open or shorted with respect to ground (MTC only, wiring fault or bad servo)
46: A/C control blend door shorted to battery (MTC only, wiring fault or bad servo)
47: A/C switch failure (MTC only)
48: A/C control mode door input shorted to ground (MTC only, wiring fault or bad servo)
49: A/C control mode door input shorted to battery (MTC only, wiring fault or bad servo)
50: A/C control electric backlite (EBL) switch fails (MTC only)

51: System voltage too low for calibration!!! (check battery cables, battery and alternator!)

Dec 10, 2014 | 2001 Chrysler Town & Country

1 Answer

Replaced heater blend door and accuator but accuator will not work

What type of car is this? There should be a way to scan the climate control system for fault codes. When you mention that the door wiggles, it makes me wonder if the door movement is restricted in some way.

May 29, 2017 | Ford Cars & Trucks

1 Answer

Everything works on a/c but only have def. no dash vents

There is a blend door that regulates where the air will come out of depending on where you set it on . Sometimes this blend door is operated on vacume from under the hood in the engine compartment if this vacume line breaks or is broken then you will have the problem you just described.Check for a broken vacume line. If the blend door is electrically operated check to see that you have voltage to the blend door motor if you have voltage then chances are the motor is bad and needs to be replaced also check the gears to the blend door most are plastic and some tend to strip. The blend door is located inside under the dash it may have a vacume line connected to it or a electrically operated motor but it should be located on the air duct some where you just have to look and know what your looking for. If you do locate it you can always move it manually with your hand to know that this is where the problem is at good luck and hope I helped you.

Jun 18, 2011 | 1995 Chevrolet Blazer

1 Answer

It blows cold air out the driver side vents instead of warm air when the heat is turned up

An all too common problem is the heat/air blend door in the climate control duct system. The blend door is either stuck, or you could have a bad actuator, ( the actuator is the device that moves the blend door based on your setting.)

I would likely have that checked first.

I hope this helps you.

Feb 10, 2011 | 2003 Hummer H2

1 Answer

Air not blowing out of vents

Most vehicles today have what is called a blend door and motor in the heater box. The blend door motor comes on when you select a setting. It actuates the blend door and directs the floe of air to the proper place. Sometimes the blend door gets stuck from debris that falls down through the vents. Also it is possible that the blend door motor is bad or simply came unplugged. Some of these motors are powered by electric automotive current and some are powered by vacum hoses. It is possible for the vacum hoses to break or become unplugged. Check all these options. One of my kids dropped a comb down my upper vent and it blocked the blend door from directing the air flow. That was an easy fix and I hope yours is a simple. I hope this helped you. Roger

Feb 07, 2010 | 2004 Chevrolet Impala

2 Answers

200 Jeep Laredo..Air is cold and fan is blowing,

there is a blend door actuator for the laredo and if is bad the air wont come out here is a pic of what it looks like and how to get to it

The single zone heater-A/C system is equipped with a single blend door actuator. The dual zone system has two blend door actuators, one for the driver side blend-air door and one for the passenger side blend-air door.
  1. Disconnect and isolate the negative battery cable.
  2. Remove the glove box from the instrument panel.
  3. Remove the three screws that secure the blend door actuator to the passenger side of the HVAC air distribution housing .
  4. Remove the blend door actuator from the air distribution housing and disconnect the HVAC wire harness connector from the actuator.
  5. Remove the blend door actuator from the vehicle
to instal
  1. Position the blend door actuator into the vehicle.
  2. Install the blend door actuator onto the passenger side of the HVAC air distribution housing . If necessary, rotate the actuator slightly to align the splines on the actuator output shaft with those on the blend door cam .
  3. Install the screws that secure the blend door actuator to the passenger side of the air distribution housing . Tighten the screws to 17 inch lbs. (2 Nm).
  4. Connect the HVAC wire harness connector to the blend door actuator.
  5. Install the glove box into the instrument panel.
  6. Reconnect the negative battery cable.

Sep 09, 2009 | 1998 Cadillac Seville

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