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How do you replace a blend door actuator in a 2004 gmc truck

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Posted on Jan 02, 2017

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SOURCE: air blend door

Replace the broken actuator.

Posted on Apr 15, 2009

  • 436 Answers

SOURCE: How do you fix the driver side air blend door actuator?

you cannot repair the actuator you need to replace it with new one. These motors turn but get weak with time. if you test it, it works, put it in and it doesn't. this is because the motor is weak, unfortunately GM does not sell these motors separately.

Posted on Aug 23, 2009

  • 1 Answer

SOURCE: Air conditioner blows hot air after 30 seconds on

I have had this problem. I am not a to correct the issue temporarily, I simply turn off the car and restart. This has worked everytime for me. In extreme cases, I think you can also remove the AC fuse and start the car, which will also reset the computer. I also think that by taking the climate control off the "AUTO" setting has worked in the past.

Posted on Oct 27, 2009

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SOURCE: How do you change a blend door actuator on a 2003

Not sure why previous poster showed you how to fix a switch in the door, but anyways.....
I had same problem as you.

My Yukon has the single overhead door, not the "barn-doors", hopefully yours is the same. Open rear cargo door. Using a trim tool (buy the set from Harbor Frieght for less than $10) remove the lower trim (at carpet), upper trim (at headliner), then the right pillar trim (mine has small Bose speaker in it). Loosen trim between passenger side back door and the cargo area main right rear trim. Remove main cargo area right main panel, by unscrewing the big black know, prying out the small plastic plug, and carefully disconnecting the AUX power plug (looks like a cig lighter outlet) once you can get behind the panel a little bit.

Now you are looking at the entire rear system. There are 2 of these actuators. The front one controls airflow going either to floor or ceiling vents, the rear one (towards middle of entire unit) controls AC vs heat percentage flowing through the ducts. Unplug the connector, and 3 screws to remove it.

Install is the reverse.

Posted on Mar 14, 2010

  • 593 Answers

SOURCE: My 2004 GMC sierra blows hot air out the drivers

If you've replaced the actuators and they are working.
One of the blend doors may be broken inside the heater box. To repair or replace the broken door you
have to remove the heater box. This is not a small job. The book gives 6-7 hours for the job. There is a
cheat that I've heard good things about. I guess it can
be done in a fraction of the time. You can find out
about it at I have not used it myself
but I know somone who has. And it worked well for
him. Hope this helps.

Posted on Mar 30, 2010

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Air blend door

Replace the broken actuator.

Apr 15, 2009 | 2004 GMC Sierra

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