Question about 2004 GMC Sierra

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Air blend door

I am having the exact same problem. After turning the ignition to off and restarting the vehicle, the A/C works properly again...for a little while. Is it really the actuator or something in the control system.

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Re calibrate the vent/blend door .
Vitally

Posted on Jun 02, 2009

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2 Answers

Heat and ac blower sound normal but very little air is moving inside the cabin. What can cause this?


Cabin air filter? Blower motor working on all speeds? Critters building nest in heater box

Feb 05, 2016 | AC Cars & Trucks

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Why 2005 pilot gets too much cabin heat even when turned off


There is blend door in vent channels under the dash of the vehicle. It blends warm and cool air in the vents depending on the temperature setting. The Blend Door is controlled by a motor called an actuator that gets its signals from the setting on the dash. When the actuator fails the blend door can't move. If it stops on hot you always get hot air.
3 possibilitys
1. Blend Door stuck.
2. Temperature control not sending signal to actuator.
3. Actuator motor gone bad.

Of the 3 possibilities the actuator motor is the most common and the easiest to fix. The part is $40-90. I don't know exactly where actuator is on the Pilot. My GMC you remove the plastic trim below the dash and its just to the left of the glove box near the 'hump'. Perhaps the part store can tell you or someone else will offer the exact location.

Once you remove the actuator you can plug it back in to the wire clip and move the temperature knob and see if it moves. When you get the new one plug it in and make sure it turns before bolting it in.

To clarify a bit. The heater is never technically turned off. The blend door determines how much it goes thru the vents.

May 04, 2014 | 2005 Honda Pilot

1 Answer

Blend door stuck on heater position and driver side blowing hot air while pass side blows cold air. How do I switch driver side blend door back to ac mode?


I had this exact problem in a 2000 and it ended up being the air filter (engine compartment, pasenger side cowl)-all I did was replace it and both sides worked properly-you could try removing it and see if that solves it, if not I would think either the climate controller has a problem (vacuum line?) or maybe the blend door itself needs to be adjusted-hope this helps

Jun 25, 2011 | 1999 Oldsmobile Intrigue

2 Answers

On my 2004 trailblazer the A/C won't divert air flow from the floor vents to the dash vents


To the Chevy Trailblazer....The HVAC system on your vehicle has small blend doors (About 4 by 3 in.) in size ...these doors will sometimes stick or the plastic rod hinge that it rotates on will break and it will not redirect the air flow..You could double check connection at the switch and for spot wear...sometimes it
also be the ( BLEND DOOR MOTOR/ACTUATOR ) This is what opens and closes the doors..It is very important to know the exact problem...To save money BEST thing to do is take to a dealer and tell them to scan your HVAC system and describe what I have stated...The dealer TECH 2 scanner will tell you exactly where the problem is...I worked for GM 2 yrs. I have changed blend doors before, sometimes you have to remove dash and that would cost very much so it is best to know exactly where problem lies....It could be the motor or switch which would be a little cheaper.....I hope this helps .Metalpoet

Mar 13, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Ticking noise from heat duct


this is a classic sign of a blend door motor or the blend door itself having a problem. the changing of the amount of heat or cold air you get out of your vents use to be obtained by turning the knob on the dash which in turn moved the heat door via a cable now all these cars and trucks have gone to using a electric motor which moves the heat door(the blend door due to the fact it blends hot and cold air to obtain the temperature requested by the driver) when these go bad its often caused by the door itself (being its made out of a plastic ) getting deformed and then binding up inside the heater box(this is the housing in which the heater core and the blend door is housed) when it binds up the blend door motor which is a very small motor with plastic gears ,cannot get the door to the position requested by the driver and continues to try and starts skipping the gears in the motor causing the ticking noise your hearing. the parts are not as expensive as the labor ,to repair requires complete removal of the dash on most vehicles to access the blend door.to test you can usually turn the temp knob back to a point were the motor is not binding and most often the noise will stop until you again attempt to move the knob to get more heat or cool air which again it cannot move the door to the place requested so the ticking noise re occurs

Dec 29, 2010 | 1994 Lincoln Town Car

2 Answers

When I turn the heat on the drivers side only kicks out cold air while the passenger side kicks out hot air...


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:
  1. Remove the instrument panel.
  2. Remove the air inlet door motor mounting screws. CAUTION
    Do not attempt to bend any part of the air inlet duct door lever.
  3. Rotate and remove the air inlet door vacuum control motor.
To Install:
  1. Rotate and install the air inlet door vacuum control motor.
  2. Install and tighten the mounting screws.
  3. Install the instrument panel.
Defroster Door Vacuum Motor To Remove:
  1. Remove the passenger air bag module from the instrument panel.
  2. Disconnect the vacuum line and remove the mounting screws. CAUTION
    Do not attempt to bend any part of the defroster airflow mode door lever.
  3. Rotate and remove the vacuum control motor from the defrost door lever.
To Install:
  1. Rotate and install the vacuum control motor on the defrost door lever.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum line to the vacuum control motor.
  4. Install the passenger's air bag module.
Floor Console Register Duct Vacuum Motor To Remove:
  1. Remove the floor console.
  2. Remove the right-side instrument panel insulator.
  3. Working from the passenger's footwell, disconnect the vacuum hose.
  4. 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.
  5. Rotate and remove the vacuum control motor from the floor console register duct door.
To Install:
  1. Rotate and install the vacuum control motor on the floor console register duct door.
  2. Install and tighten the mounting screws.
  3. Connect the vacuum hose to the floor console register duct vacuum control motor.
  4. Install the insulator under the dash.
  5. Install the floor console.
Panel/Floor Door Vacuum Motor To Remove:
  1. 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.
  2. Label and disconnect the two vacuum hoses.
  3. Remove the mounting screw.
  4. Lift, rotate and remove the panel/floor door vacuum control motor from the door lever.
To Install:
  1. Install the panel/floor door vacuum control motor on the door lever.
  2. Install and tighten the mounting screw.
  3. Connect the vacuum hoses in their original positions.
  4. Install the shield on the vacuum motor.
Auxiliary Air Distribution Blend Door Actuator To Remove:
  1. Remove the right rear quarter trim panel access panel. Auxiliary climate control housing removal and installation ford-10-00-4589.gif

  2. Remove the auxiliary air distribution blend door actuator screws.
  3. Disconnect the auxiliary air distribution blend door actuator connector.
To Install:
  1. Connect the auxiliary air distribution blend door actuator connector.
  2. Install the auxiliary air distribution blend door actuator screws.
  3. Install the right rear quarter trim panel access panel.
Auxiliary Temperature Blend Door Actuator To Remove:
  1. Remove the right rear quarter trim panel. Auxiliary climate control housing removal and installation ford-10-00-4589.gif

  2. Disconnect the temperature auxiliary temperature blend door actuator connector.
  3. Remove the temperature auxiliary temperature blend door actuator screws.
  4. Remove the temperature auxiliary temperature blend door actuator.
To Install:
  1. Install the temperature auxiliary temperature blend door actuator.
  2. Install the temperature auxiliary temperature blend door actuator screws.
  3. Connect the temperature auxiliary temperature blend door actuator connector.
  4. Install the right rear quarter trim panel.
--- In-Car Temperature Sensor Removal & Installation To Remove:
  1. Remove the instrument cluster finish panel.
  2. Disconnect the in-vehicle temperature sensor connector.
  3. Disconnect the in-vehicle temperature sensor aspirator tube.
  4. Remove the in-vehicle temperature sensor screws.
  5. Remove the in-vehicle temperature sensor.
To Install:
  1. Install the in-vehicle temperature sensor.
  2. Install the in-vehicle temperature sensor screws.
  3. Connect the in-vehicle temperature sensor aspirator tube.
  4. Connect the in-vehicle temperature sensor connector.
  5. Install the instrument cluster finish panel.
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Oct 07, 2010 | 2004 Ford Freestar

2 Answers

AC blows hot air on the driver side and cold air on the passenger side


You may have a bad temperature door actuator motor on the drivers side. The actuator is what moves the temperature blend door and when it fails it usually moves the door all the way to the "hot" position. Sometimes if you shut the vehicle off for a bit then restart it the system will work fine for a while then the actuator will again swing the door all the way open or shut. I've replaced several of these actuators [both drivers side and passenger side] for similar problems.

Jul 08, 2010 | 2005 Chevrolet Silverado

1 Answer

Air Conditiner starts blowing hot air on drivers side only turn off engine then re-start and it's fine


If your vehicle has dual climate control settings then you may have a failing temperature blend door actuator motor on the drivers side. These actuators move the temperature door to match the settings selected at the controls on the dash but sometimes don't feed back the proper information to the controler and the result is that the door will move too far one way or the other giving you too much hot or cold air. When you shut off the vehicle for a few moments and restart it the system cycles the doors and figures out where everything is and it will work for a while until the feedback signal is lost again.

Jun 15, 2010 | Cars & Trucks

1 Answer

Air conditioning silverado


The problem is in the heater box. To be more specific, the blend door. Check blend door operation and blend door motor. Located right side under dash. Remove blend door motor, with vehicle running, move switch from panel to defog and see if blend door motor moves.

Jul 25, 2009 | 2005 Chevrolet Silverado

2 Answers

Heating system only blows out hot air through the vents


I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.

Avalanche, Sierra And Silverado
  1. Remove the floor air outlet duct extension (1) from the floor duct (2). 0900c152801c9c8a.jpgRemove the floor air outlet duct extension (1) from the floor duct (2)
  2. Disconnect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  3. Remove the blend door actuator mounting screws from the HVAC module.
  4. Remove the blend door actuator as an assembly with the actuator cam. 0900c152801c9c8c.jpgRemove the blend door actuator mounting screws from the HVAC module
To install:
  1. Install the blend door actuator as an assembly with the actuator cam.
    1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
    2. Line up the A/C valve lever with the blend door actuator cam
  2. Install the blend door actuator mounting screw to the HVAC module.
    1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).
  3. Connect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  4. Install the floor air outlet duct extension (1) to the floor air duct (2).
C/K Series
  1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
  2. Remove the screws.
  3. Remove the adjuster links from the control lever.
  4. Remove the mode actuator.
  5. Adjust the mode actuator by completing the following steps:
    1. Connect the electrical connector to the actuator.
    2. Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
    3. Turn the ignition switch to the OFF position.
    4. Remove the actuator from the electrical connection. 0900c152801c9c8d.jpgBlend door actuator-C/K Series
To install:
  1. Install the mode actuator.
  2. Install the screws.
  3. Install the adjuster links to the control lever.
  4. Connect the electrical connector.
  5. Test the circuit operation

Nov 27, 2008 | 2001 Chevrolet Silverado

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