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Blend Door Actuator Problem


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#1 kyddm

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Posted 02 November 2009 - 09:14 PM

2003 GMC Sierra blowing hot air on driver side. Took out blend door actuator that controls driver side heat/air. Manually operated door and got cool air or hot air so door is not a problem. I am trying to figure if it is the actautor or the control. Took the actuator apart and checked motor with 9v battery and motor will turn both ways when hooking directly to motor leads. When I put it back together and hook battery to leads where it plugs in, it will only move one way. When I reverse polarity here, it will not turn back. When I hook it back up in the truck without connecting to the door where I can watch it, when I turn on the key it moves very little and then returns back and it will not respond by sliding the temp control at all. Also the light on the driver side temp control is out. Does this sound like the control unit or the actuator?

#2 CapitalTruck

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Posted 02 November 2009 - 11:45 PM

I would be looking at that actuator man, those things seem to go far more often (from my understanding) than control heads. I personally have had one go on my 04, it's getting ready to go again. (a bunch of cliicking noises).

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#3 kyddm

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Posted 03 November 2009 - 07:53 PM

The gearing in mine is fine and the motor seems to be fine. If you hook a battery to the motor leads the motor turns. Reverse leads and it turns the opposite way. But when you hook the battery to the pins on the actuator, the motor turns one way, but if you reverse the leads it will not turn back. It does not repond at all when hooked up and you slide the temp control. Just trying to figure if it is the circuit board in the actuator or maybe the temp control. It does get some power when you turn the key on it will move about a 1/8 of the turn and then goes back and will not move at all.

#4 MrMusicMaker

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Posted 26 December 2009 - 03:28 PM

My 03 is doing the same thing.

Any luck on fixing this yet?
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#5 snakedoctor

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Posted 26 December 2009 - 04:10 PM

http://www.gmfullsiz...ad.php?t=177146

#6 snakedoctor

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Posted 26 December 2009 - 10:11 PM

Also see this.. They also say never put power to the actuator without it being hooked up.......


http://chevroletforu...ead.php?t=22624

#7 alwcurlz

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Posted 27 December 2009 - 12:18 AM

Also see this.. They also say never put power to the actuator without it being hooked up.......


http://chevroletforu...ead.php?t=22624


+1 on that one. I made that mistake and had to take mine apart and move the worm gear enough times for it to be within the operating range and then recalibrate the system.

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#8 alwaysrollin

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Posted 27 August 2011 - 11:14 AM

Fellas, gotta give it to ya, the info on here was incredibly acurate and fixed my a/c issue with blowing hot air on driver's side and cold air on passanger side. ordered drivers side actuator off of amazon cheap and installations were clear on this site for install. Could'nt have done it with out ya boys!!! Thx a million!!!!

:) :)




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