Question about GMC C2500

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It start out in defrost and through the day it switches to floor mode and will not come out of floor mode

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The butterfly in your dash is not openning correctly.

Posted on Mar 24, 2011

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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

1 Answer

Heater and cooling


your blend door is not working this a door that switches it to other spots on your heater this is located in the heater box

Jan 02, 2014 | 1998 Plymouth Voyager

1 Answer

On a 1993 Grand Caravan, the air flow will only come out as defrost. Can not change to mix, or floor


Hi Jim, I'm glad to help!

Jim lets try something first, here's what I need you to do. Take the negative battery cable off for 20 seconds and before hooking it back up make sure your blower is on HIGH and the control head is in the panel mode (Face Mode) and the temperature is in full cold. Hook the battery back up and start the engine. NOTE: DO NOT touch the control head until it has gone through all the calibration modes and came back to rest at the panel mode and the air flow stays in the panel mode. When this happens the calibration is complete. Then see if it switches to all the other modes. Hope this helps and have an awesome day Jim.

Nov 12, 2012 | 1993 Dodge Grand Caravan

1 Answer

Cant switch between defrost panel or floor heat stuck in defrost


sounds like maybee a blend door issue or a vaccuum lek

Nov 30, 2011 | 2001 Ford Taurus

1 Answer

1998 blazer heat works great but defrost doesnt, could there be a blocked hose and how do i check?the defrost at the front wont blow.


if you have heat and nothing blows on defrost then this is a mode door problem that is not changing from floor to vent to defrost mode.it could be the mode switch or the mode door not working.the mode door is on the air duct under the dash and you can manually move it when you disconnect the control with your hand it should move freely.some of these have a small motor that moves the door.and if you move the switch in different modes or better have someone move the switch while you see were the door is the one that is moving is the mode door.if it won`t move on defrost tap the motor and see if it starts to work.if it does then it will have to be replaced if not it could be a switch problem.

Oct 26, 2011 | 1998 Chevrolet Blazer

1 Answer

The AC only works in defroster mode. If I move the control knob works in the same mode. How can I fix it?


you will have to replace the mode control switch that changes the mode from defrost to vent to floor.make sure the knob is not spinning on the switch shaft as this will cause the problem as well.

Sep 08, 2011 | 1997 Mercury Sable

1 Answer

The a/c in my 1999 ford f150 works but started blowing out the defrost and by my feet. Nothing comes out the a/c vents. Please help.


floor/defrost is default mode when system looses vacuum.you need to trace lines from the
intake manifold back to mode selector(floor,vent,defrost)in car for vacuum.usually worn crack
vacuum hose

Jun 24, 2011 | Ford F-150 Cars & Trucks

1 Answer

Air won't come out of vents, but will from defrost and floor.


if it switches function even only a few then the problem is not the vacuum source (if u had no vacuum it would default to defrost mode) the problem is the dash control head vacuum mode control switch, i don't think u can just replace the switch, u have to buy the whole climate control module.

May 21, 2009 | 1996 Cadillac DeVille

1 Answer

Switch on dashboard does not change air direction to flow & vents


Defrost is the default mode so if the system fais, you alays have defrost. The mode doors are controlled by vacuum motors. I would suspect a vacuum leak in the engine compartment on the hose going from the engine through the firewall and into the heater controls. Some systems have a vacuum storage canister that can also leak. The canister stores vacuum when vacuum drops going up a hill.
Or, you have a bad heater control head that is not passing vacuum to the vacuum motors on the mode doors.

Here's a diagram of the system for reference.

826b4f9.gif

Feb 15, 2009 | 1999 Ford F150 Regular Cab

1 Answer

Defroster & floor blowers don't work but front facing vents do


There are what they call mode door's these days they have a electrical motor that turnes the door to different posistions...sounds like yours is become broken. It would depend on your expertise in the ac & heating system area to replace the part. Sometimes easy and most of the times the dash has to be removed.

Feb 12, 2009 | 2002 Chevrolet Silverado

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