Question about 2004 Chevrolet Avalanche

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From the posts on this site I feel sure that both of my front blend door actuators have on haywire as they will both act up from time to time. The funny thing is that they both started to act up at the same time. Any thoughts?

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  • mesmith139 Aug 20, 2010

    The driver side and the passenger side will sometimes blow hot air when I have the A/C on. It just seemed strange that they both started acting up within a day or two of each other. I can turn the engine off and restart and sometimes it will correct the problem and sometimes not.

  • mesmith139 Aug 20, 2010

    I am new at this and am not sure whether I posted my response to your question in the proper place, so I am repeating it here.



    The driver side and the passenger side will sometimes blow hot air when I have the A/C on. It just seemed strange that they both started acting up within a day or two of each other. I can turn the engine off and restart and sometimes it will correct the problem and sometimes not.

  • mesmith139 Aug 20, 2010

    This was very helpful and I'm sure I will use it again.

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What are the symptoms exactly?

Posted on Aug 20, 2010

  • yadayada
    yadayada Aug 20, 2010

    this system has the ability to test itself, the dealer can perform this test and it will move the blend doors and report any problem(s) sensed, the dealer will need to run this test,since replacing the doors requires the removal of the entire dash assembly (10-12 hour job) I strongly suggest you have the dealer run the diagnostics and then do the work yourself, u absolutely will need a factory shop manual, so go on ebay and finds a used set, I really doubt the problem is that both doors went out.

  • mesmith139 Aug 20, 2010

    Thank you for the advice. I will schedule with my dealer.

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How to replace the door blend actuator on 2009 lincoln mks


Right side or left ? Electronic Automatic Temperature Control or manual ? Temperature or mode door ?
Temperature Blend Door Actuator - LH Removal and Installation
NOTE: It is not required to install the new LH temperature blend door linkage parts included in the LH temperature blend door actuator service part kit if only the temperature blend door actuator requires replacement and the linkage parts are not broken or binding.
LH temperature blend door actuator and linkage
  1. Remove the 2 lower steering column opening cover bolts.
  1. Detach the lower steering column opening cover.
  1. Disconnect the in-vehicle temperature sensor aspirator hose and electrical connector.
  1. Position the instrument panel wire harness away from the LH temperature blend door actuator.
  1. Remove the 3 LH temperature blend door actuator screws.
  1. Disconnect the LH temperature blend door actuator electrical connector.
  1. Remove the LH temperature blend door actuator.
  1. Manually operate, and inspect the LH temperature blend door linkage for incorrect placement, binding or damage.
Temperature Blend Door Actuator - RH, Dual-Zone EATC Removal and Installation
NOTE: It is not required to install the new RH temperature blend door linkage parts included in the RH temperature blend door actuator service part kit if only the temperature blend door actuator requires replacement and the linkage parts are not broken or binding.
RH temperature blend door actuator and linkage
  1. Disconnect the glove compartment damper from the glove compartment.
  1. Remove the glove compartment.
  1. Remove the RH lower instrument panel insulator.
  1. Remove the RH lower floor console trim panel.
  1. Remove the 3 RH temperature blend door actuator screws.
  1. Disconnect the RH temperature blend door actuator electrical connector.
  1. Remove the RH temperature blend door actuator.
  1. Manually operate, and inspect the RH temperature blend door linkage for incorrect placement, binding or damage.
  2. Mode Door Actuator - Defrost/Panel/Floor Door
  3. Removal and Installation
    NOTE: The defrost/panel/floor mode door actuator can be accessed from below the driver side of the instrument panel.
    NOTE: It is not required to install the new defrost/panel/floor mode door linkage parts included in the defrost/panel/floor mode door actuator service part kit if only the mode door actuator requires replacement and the linkage parts are not broken or binding.
    Mode door actuator and linkage
    1. Remove the 3 defrost/panel/floor mode door actuator screws.
    1. Disconnect the defrost/panel/floor mode door actuator electrical connector.
    1. Remove the defrost/panel/floor mode door actuator.
    1. Manually operate, and inspect the defrost/panel/floor mode door linkage for incorrect placement or damage.
    Mode door actuator linkage only
    1. Remove the mode door linkage.
      1. Depress the tab and remove the panel door lever.
      1. Remove the floor/defrost door intermediate lever screw and floor/defrost door intermediate lever.
      1. Pull straight outward to remove the floor/defrost door lever.
    Mode door actuator and linkage
    1. NOTE: When installing the mode door actuator, make sure that the panel door lever and floor/defrost intermediate lever are correctly aligned with the mode door actuator cam.
      To install, reverse the removal procedure.

Nov 10, 2016 | 2009 Lincoln MKS

2 Answers

Have a 02 GMC SIERRA base model. Not getting air to the floor. (Air or Heat) Replaced the control unit with very little change. The motor for the blend door works fine. Could it be the blend door its...


This is not the blend door if air is coming out somewhere else. It could be the mode door or it could be the in cabin air filter that needs to be replaced.

Dec 09, 2014 | Cars & Trucks

2 Answers

2000 yukon denail front a/c not cold rear a/c is


First of all get the Freon level checked, if Freon/ refrigerant is low then it can cause this problem.Wen Freon is low it takes time to cool.--- So first get Ac pressure tested.It can be tested at any local car garage.Some times pressure will be checked OK, but still if Freon is getting clogged in the line/ tube then it will not reach the front , but reaches rear then front will not cool, but rear will.--------

But mostly this problem is related to blend door.

If the rear is working well and front is not I would suspect a blend door or actuator issue in the front.Double check and see if you can hear anything moving when you are adjusting temperature from hot to cold.Also check and make sure the air flow moves properly from defrost to vents and floor etc.

Either a bad blend door motor or Climate Control Assembly. 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 blend door actuator is located behind the glove box.-----

To see blend door diagram for your Yukon Denail, click the link below :---

http://howtobyme.blogspot.com/2011/08/where-is-blend-door-actuator-located-on.html

------------

This will help.Thanks.Helpmech.

Aug 22, 2011 | GMC Yukon Denali Cars & Trucks

1 Answer

It's 20 degress outside and my 1998 navigator only blows heat from the rear vents, cold air from the front vents. What could cause this problem. I know the heating coil is not out because it blows heat in...


Hi, there is a separate heater core for the front vents, but my guess is your blend door actuator or the door itself is to blame. Just for grins, make sure both heater hoses are hot as they connect to the heater core in the engine compartment. If it's really the blend door, there is a pretty good answer at the following post: http://heatertreater.net/Lincoln%20Navigator%2097-02.htm
Though it's a pain, I would check the actuator first. You have to remove the center console to access the actuator. Take it out to see if it's working (pull connector back in, turn key on and see if acturator turns when temp setting is changed). I also have a generic post on heater issues that may be worth your time to read (http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air). Please let me know if you have any questions and thanks for using FixYa.

Jan 12, 2011 | Lincoln Navigator Cars & Trucks

1 Answer

2000 FORD Expedition both heater hoses get warm. gets heat at first then turns cold front and back. I flushed the heater core and didnt get any gunk out. Is this the heatercore or is this the blend door


if the heater hoses are both hot its a blend door actuator, and possably the blend door its self, the way to make sure is to feel around under the dash . feel the black hvac box and if its feels warm then the heater core is good, you will have to remove the dash to replaced the bland door actuator and blend door ,i reccomend you replace both beacause its alot of work to remove the dash so make sure both components are replaced while you are in there

Dec 18, 2010 | 2000 Ford Expedition

1 Answer

My 2004 Avalanche ' heating system will not heat. No matter what the setting it either blows no air or cold air and it is 25 degrees outside so this is a problem. The engine is up to temp and I have tried...


The most likely cause is a failed blend door actuator; however I recommend a little troubleshooting. First, can you hear a clicking sound behind the dash when you turn the setting to hot? If yes, it is certainly the actuator stripping its gears. If not, check to make sure the heater hoses are both hot as they connect to the heater core at the firewall (in the engine compartment). If one or both of the hoses do not get hot, there is a blockage caused either by an air bubble or a stuck water control valve in the heater hose. If the hoses are both hot, the indication is again the blend door actuator.

Below are instructions for replacing the actuator. Look at the diagrams carefully--the big arrows point to the front of the truck and the actuator is on the side of the heater box above the outlet duct that runs to the driver's side of the floor. Also, the actuator is expensive, so I recommend you make sure it's bad and shop around a bit to get a good price. To check out the actuator, first see if you can turn the blend door by hand. If you can't turn it, maybe it's jammed. Also, reconnect the actuator after removing it and see what it does when you turn the heater to hot.

Removal & Installation
  1. Remove the floor air outlet duct extension (1) from the floor duct (2).

    jturcotte_393.gif

Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)


Disconnect the electrical connection at the blend door actuator (#10 in pic below). jturcotte_394.gif

Fig. Blend door actuator and related components


Remove the blend door actuator mounting screws from the HVAC module.


Remove the blend door actuator as an assembly with the actuator cam.
jturcotte_396.gif

Fig. Remove 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).
  4. Install the floor air outlet duct extension (1) to the floor air duct (2).


Picture of actuator:


jturcotte_57.jpg

Dec 07, 2010 | 2004 Chevrolet Avalanche

1 Answer

The heater/vent system will not blow warm/hot air even when dialed to 90 degrees on climate control


On a newer truck such as yours, the problem is usually the blend door actuator. First try a recalibrations of the system. Remove the HVAC fuse for a couple minutes and then put it back in. Start the truck and let it idle for a few minutes. Check to see if that fixed it.
If not, next check the actuator. I will paste instructions below for taking it out. Once you have it out, plug the connector back in and see if it turns when you change the temperature control. If not, the problem can be in the controller or the actuator. If it is clicking, the problem is stripped gears. If it isn't doing anything, you can check for voltage at the connector with a voltmeter. Connect the black meter lead to a good ground point and probe the connector terminals with the red lead while changing the temperature setting. The part costs $140, so do what you can to make sure it's bad before putting a new one in. Also, it may be worth your time to read my post at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air for other ideas. Please let me know if you have questions.

  1. Remove the floor air outlet duct extension (1) from the floor duct (2).
3270ebc.gif

Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)

2. Disconnect the electrical connection at the blend door actuator (10).

3beb6ca.gif

Fig. Blend 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.

8a083a6.gif
Fig. Remove the blend door actuator mounting screws from the HVAC module

Oct 31, 2010 | 2006 Chevrolet Silverado

1 Answer

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.

Jan 14, 2010 | Ford Windstar Cars & Trucks

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