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Jeff Posted on Sep 23, 2008
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Blend door not working.

My blend door is not working. I get no air to the front vents and the air is diverted to the defroster. Air will switch to floor. This was an intermediate problem but is now pretty much stuck. How is the blend door actuated. How difficult is the blend to access to repair?

  • 4 more comments 
  • Jeff Sep 23, 2008

    Maybe the more correct term is the heat/defrost door that sits next to the blend door. I do not believe it to be a switch control issue as you can tell the the system attempts to do the right thing and all other functions work fine. I think that something found it's way into the unit and is preventing the door from functioning properly. Like I mentioned, it would work intermittenly.

    I ran into a Chrysler service manager a year or so ago and we briefly discussed what was happening and he said "blend door". Did not have a chance to talk about how difficult the job would be to get in there to clean it up or find the problem. I have the factory service manual and it has more warnings about what not to do than explaining how or what to do.

    Thanks

    Jeff

  • Anonymous Mar 13, 2014

    The blend door is not working right or the in car air temperature sensor is faulty. Removal & Installation Air Inlet Door Vacuum Motor To Remove: Remove the instrument panel. Remove the air inlet door motor mounting screws. CAUTION Do not attempt to bend any part of the air inlet duct door lever. Rotate and remove the air inlet door vacuum control motor. To Install: Rotate and install the air inlet door vacuum control motor. Install and tighten the mounting screws. Install the instrument panel. Defroster Door Vacuum Motor To Remove: Remove the passenger air bag module from the instrument panel. Disconnect the vacuum line and remove the mounting screws. CAUTION Do not attempt to bend any part of the defroster airflow mode door lever. Rotate and remove the vacuum control motor from the defrost door lever. To Install: Rotate and install the vacuum control motor on the defrost door lever. Install and tighten the mounting screws. Connect the vacuum line to the vacuum control motor. Install the passenger's air bag module. Floor Console Register Duct Vacuum Motor To Remove: Remove the floor console. Remove the right-side instrument panel insulator. Working from the passenger's footwell, disconnect the vacuum hose. Remove the screws and the floor console register duct vacuum control motor. CAUTION Do not attempt to bend any part of the floor console register duct door lever. Rotate and remove the vacuum control motor from the floor console register duct door. To Install: Rotate and install the vacuum control motor on the floor console register duct door. Install and tighten the mounting screws. Connect the vacuum hose to the floor console register duct vacuum control motor. Install the insulator under the dash. Install the floor console. Panel/Floor Door Vacuum Motor To Remove: Working through the driver footwell, remove the two screws and the shield. CAUTION Do not attempt to bend any part of the airflow mode door lever. Label and disconnect the two vacuum hoses. Remove the mounting screw. Lift, rotate and remove the panel/floor door vacuum control motor from the door lever. To Install: Install the panel/floor door vacuum control motor on the door lever. Install and tighten the mounting screw. Connect the vacuum hoses in their original positions. Install the shield on the vacuum motor. Auxiliary Air Distribution Blend Door Actuator To Remove: Remove the right rear quarter trim panel access panel. Auxiliary climate control housing removal and installation Remove the auxiliary air distribution blend door actuator screws. Disconnect the auxiliary air distribution blend door actuator connector. To Install: Connect the auxiliary air distribution blend door actuator connector. Install the auxiliary air distribution blend door actuator screws. Install the right rear quarter trim panel access panel. Auxiliary Temperature Blend Door Actuator To Remove: Remove the right rear quarter trim panel. Auxiliary climate control housing removal and installation Disconnect the temperature auxiliary temperature blend door actuator connector. Remove the temperature auxiliary temperature blend door actuator screws. Remove the temperature auxiliary temperature blend door actuator. To Install: Install the temperature auxiliary temperature blend door actuator. Install the temperature auxiliary temperature blend door actuator screws. Connect the temperature auxiliary temperature blend door actuator connector. Install the right rear quarter trim panel. --- In-Car Temperature Sensor Removal & Installation To Remove: Remove the instrument cluster finish panel. Disconnect the in-vehicle temperature sensor connector. Disconnect the in-vehicle temperature sensor aspirator tube. Remove the in-vehicle temperature sensor screws. Remove the in-vehicle temperature sensor. To Install: Install the in-vehicle temperature sensor. Install the in-vehicle temperature sensor screws. Connect the in-vehicle temperature sensor aspirator tube. Connect the in-vehicle temperature sensor connector. Install the instrument cluster finish panel.

  • Anonymous Mar 14, 2014

    Is there a blend door

  • Anonymous Mar 17, 2014

    Mechanic says it is the blend door.
    How difficult is it to get to it?
    How much does it cost approximately?

  • Anonymous Mar 17, 2014

    2008 altima blend door actuator

  • Anonymous Mar 21, 2014

    how to recalibrate blend door actuator

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1 Answer

Marvin

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  • Dodge Master 85,242 Answers
  • Posted on Sep 23, 2008
Marvin
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Joined: Jun 20, 2008
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The bleed door controls air temp not where it comes out, dash, floor, defroster, this is most likely a mode control switch problem, that switch is on the ac control head.

1 Related Answer

Anonymous

  • 512 Answers
  • Posted on Nov 13, 2008

SOURCE: Blend door not working.

check the vacuum supply and vac lines from the control head for a leak

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1998 Dodge Stratus - Air conditioning is blowing through the defrost vents

Vacuum controls this circuit and leaks will cause blend air door to default to defrost. Check for bad check valve or hose leaks under hood first as these are the easy ones to get at and under hood heat causes deterioration.
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Air conditioner switch is stuck in defrost position what to do

Problem is usually a stuck or faulty blend door motor under the dash.
The blend doors direct air thru the heater and ac evaporator as well as the vents.
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Most of A/C air is coming out of defrosting vent. Could there be a switch malfunct.

Do an internet search for "blend door repair" - - - the blend doors direct air thru the heater core and evaporator core along with the vents.
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Cold air comes out the defrost vent all the time. 1994 buick le sabre. no air comes out the front registers.

The most common cause is the blend door actuator. It's the door that diverts air between the floor, vents, and defroster. Sometimes the part will get stuck in 1 position. Some cars have cable driven blend doors, others are electronic.
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95 chev. pickup. Cool air comes out at floor. Cannot divert any air to the vents or defroster vent. Can feel warmth on the black plastic box like thing near the floorboard so I know there is warm water...

It sounds like the actuator that diverts the air may have gone out. I would suggest replacing the blend-door actuator so that your air will go to the right places. The blend door actuator shouldn't cost more than $150.
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1984 s10 pick up a/c blow from bottom or top not vent?

  1. air diverter vaccum operated
  2. vaccumm mode switch is in control head
  3. remove screw under front edge of control console
  4. gently pull forward to access vaccumm lines
  5. mode switch is inexpensive $10.00
  6. mode switch routes vaccumm to vac motors that work mode, blend , recirc ,defrost doors.
  7. vaccumm mtrs are cheap but hard to change
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My heater will only blow hot air out of the rear vents from the rear controls. The front vents only blow cold air. Is there a simple fix?

blend door or temp contrl switch is bad.

Section 12-02: Heating and Defrosting 1998 Windstar Workshop Manual
REMOVAL AND INSTALLATION Actuator Motors, Electric Temperature Blend Door
Removal
  1. Remove cassette storage box or center shelf unit, if equipped.
  1. Remove instrument panel ash receptacle (04810) by depressing service lever.
  1. Disconnect electrical harness connector from electric blend door actuator.


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  1. Remove three retaining screws.


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  1. Carefully pull electric blend door actuator outward and off A/C evaporator housing (19850) assembly.
Installation
  1. Follow removal procedure in reverse order.
  1. Air temperature control door shaft is keyed. Move door to properly insert electronic actuator shaft. Make sure the shaft is completely in and properly seated.
5helpful
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A/C only blows through defrost vents. Won't switch to floor Or foot vents . Have tried a 2nd control unit in dash

It sounds like the blend door actuator which diverts air from defrost to vent to the floor.
The bad news is it's a bear to get at. It's located behind the glove box.
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Air blend doors do not work. Air blows from defroster vents

check or loss of vacuum to mode control switch in dash ac control. these are not blend doors, they are air flow control, a blend door controls the air temperature not where it comes out.
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Blend door not working.

check the vacuum supply and vac lines from the control head for a leak
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