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Blend door is stuck

When I turn the knob from cold to hot or hot to cold, I can hear the blend door or damper sounds like it's slamming shut but it's actually getting stuck. It will make a slamming sound until it finally moves into the correct position, then I can hear clicking like it is not fully in position

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Posted on Jan 02, 2017

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SOURCE: heater control door stuck on the cold side.makes clicking sound

I ended up taking the vehicle to the dealer. The 'blend door' actuator had gone bad (stripped gear?). $66.00 for the part over $330 for labor. The console and part of the dash had to come out.

Posted on Mar 19, 2009

  • 4369 Answers

SOURCE: Blend door for front temp control is stuck in the

Control System Inputs
Climate Control Assembly
The climate control assembly has three control systems:

  • The A/C heater function selector switch combines a vacuum selector valve for direct control of the vacuum control motors and electrical input to the instrument cluster module.
  • The temperature selection is accomplished with a potentiometer connected to the electric blend door actuator that controls positioning of the temperature blend door. Movement of the control knob (18519) from COOL (blue) to WARM (red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.
  • The blower motor switch controls the blower motor speed through a series of resistors and a relay.
Control System Outputs
Blower Motor Switch Resistor
The heater blower motor switch resistor has the following features:
  • The assembly is located on the passenger side of the plenum assembly behind the glove compartment (06010).
  • Three resistance elements are mounted on the resistor board to provide four A/C blower motor speeds.
  • Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or increase A/C blower motor speed.
  • An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F), interrupting the blower motor operation in all speeds except HI.
  • The thermal limiter cannot be reset.

A/C Electric Blend Door Actuator
The A/C electric blend door actuator is located on the plenum assembly.
  • Its function is to move the air temperature blend door on command from the control assembly.
  • The A/C electric blend door actuator contains a reversible electric motor and a potentiometer. The potentiometer wiper is connected to the actuator output shaft and moves with the output shaft to indicate the position of the air temperature blend door.

Posted on Dec 26, 2009

  • 3 Answers

SOURCE: On my 2001 windstar when

Global 1207 is right. It's your blend door actuator which is sticking. Probably the plastic teeth on the cog inside are worn. It is white plastic and is located behind your radio. It controls the opening of your blend door from A/C (closed) to heat (open). Buy a Ford Windstar radio removal tool from any parts store (less than $10.00) remove the radio. You will then have access to the actuator. At the bottom right you will see a little plastic wheel with an indented square. Find a long flat head screwdriver that wil fit diagonally into the square and turn it clockwise slowly. The blend door should pop open and heat will enter the cabin. Finally when you have the time replace the unit. They sell for about $75.00 at the dealer or cheaper elsewhere. Good luck. This worked for me.

Posted on Oct 15, 2010

  • 5158 Answers

SOURCE: 2002 Ford Crown Vic 4.6L. EATCM A/C, Heating

that clicking noise you hear is likely a relay in the fuse panel that needs to be replaced. the easiest way to find out which relay it is would be to put you finger on each relay as you actuate the device not working. once you locate the clicking relay replace it . to reset the computer just unhook the battery for about ten minutes. if you have an anti theft radio make sure you know the code for it and how to enter it before you unhook the battery.


Posted on Nov 27, 2010

  • 1152 Answers

SOURCE: 1999 ford f150 only blows

the flapper door is not closing and opening is located in the duct work....remove heater control panel and follow the cable to the flapper door

Posted on Jan 26, 2011

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1 Answer

How do I confirm a blend door / actuator problem?

blend door concerns heat and cold air ducting flapper. whether electronic or manual truning of a knob there is a movement noise. a motor/s make/s a sound on electronic controlled ones or a turn knob harder at times to turn does this. then feel the changes hot/cold breeze and no breeze etc..on the vent according to what you turn the system on to do. it is best to confirm movement /motion of the internal motor or flapper during night time or early morning in the garage inside the car devoid of noise to hear the motor or flapping movement, must hear some motor effort or feel hand effort if cable to the heater valve is intact/ not snapped to open heater valves on the engine side. then inspect heater cable if heater is not working etc..hope this helps.

Nov 24, 2014 | 1999 Mercury Grand Marquis

1 Answer

Hearter temp control was blowing too hot, now only blows cold

Clicking sound you hear is the worn brushes in your blower motor. At this point the blower moter may or may not start with the switch. THe blower motor is faulty so I would change that first, then check for vacuum leaks or faulty selector cable for the heat blend door. It could have came off door side or heater control side.

Dec 14, 2013 | 2010 Dodge Nitro

1 Answer

Blend doors not blending, only blowing out hot or cold, no in between.

if this is an electronic problem then i would disconnect the operating mechanisms and fit a couple of cables from a bicycle gear change ,yes i know its ugly but mounted out the way under the dash or inside the glove box ?? most likely cause is electronics for what ever reason and i would even like to guess

Nov 22, 2011 | 2006 Chrysler 300

1 Answer

The a.c compressor works and the drier is sweating cold water outside the truck but HOT air comes out of the vents no matter the setting on the temperature control knob. Any ideas?

Make year and model engines size and country it was sold new in will help tell what kind of system you have, 60's modeels are different then 70's and so forth to the present. 90's and newer have electric air doors and it' possiblre that the cold air blend door motor is'nt working or stuck or fuse blowed. The blend door changes the temperture from hot to cold by dircting the air over the evaporater core or the heater core to get the dired temperture. Reaching up from under the dash with the truck running and the airconditioner on and the fan on ( not high) touch all the different motors till you find the one thats moving as you turn the control from hot to cold. if it's poping or grinding or you can't find any of them responding you need a new blend door motor. Working the other controls like the frst to reciculatre ( that motot will move as you turn this control on and off and the made door motor changes as you ask for defrost to floor to panel. The one that's not working needs changed. Most auto parts stores have them as they fail alot. thier les than 50 bucks some are as little as 25 but you did;nt state the year of your truck.

May 16, 2011 | Chevrolet C1500 Cars & Trucks

2 Answers

No heat

yes you will find that the little lever or rod has become detached from the direction flap under dash,sometimes cir clip falls out

Feb 14, 2010 | 2004 Ford Explorer

1 Answer

A/c doesn't work, heater runs on high without command,sometimes unable to shut-off

You need to check your blend door. It sounds like its stuck on heat. Your blend door would be the switch that changes from hot to cold.

May 08, 2009 | 2005 Chrysler Town & Country

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

1 Answer

AC Vacuum Leak

The temp blend door is operated by a vacuum motor.At higher engine rpms the manifold vacuum decreases.Most manufactures incorporate a vacuum storage tank to compensate for this lose of vacuum.So it does sound like you have a vacuum leak to the ac control unit.There should be a vacuum line going through the firewall into the cab.Inspect this line for leaks.Good Luck!!!!

Aug 04, 2008 | 2000 Dodge Ram 1500 Truck

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