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Blend door actuators?

Tiny
FOWLER17Z
  • MEMBER
  • 2015 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 71,000 MILES
The defrost mode will not engage. It stays on the main vents. I can change the temperature for both sides of the truck. But will not go to the defrost vents at all. This is a 1500 crew cab.
Monday, January 21st, 2019 AT 10:35 AM

22 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I attached a picture for you to view. The actuator, which is a common failure, is under the dash that controls the mode door operation.

https://www.2carpros.com/articles/replace-blend-door-motor

Roy
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Monday, January 21st, 2019 AT 1:09 PM
Tiny
FOWLER17Z
  • MEMBER
  • 2 POSTS
Well there it goes. Lol so anyways thank you for the information and photo. The dealer contacted me and said it’s a safety hazard. So there fixing it for free. But I’m sure all that information will help in the future and all the other people having similar problems.
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Monday, January 21st, 2019 AT 4:14 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Your welcome.

Always glad to help

Roy
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Monday, January 21st, 2019 AT 4:27 PM
Tiny
AARONPHILLIPS81
  • MEMBER
  • 7 POSTS
  • 2009 GMC SIERRA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 89,000 MILES
I am looking for locations of the blend door actuator under the dash. I have changed both the ones on the floorboard area on the driver and passenger side.
I appreciate any help!
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Friday, December 18th, 2020 AT 8:21 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If you replaced on e on bottom and one on driver side that is for left hand side and mode- meaning direction. The right hand side is on top and normally requires dash to be pulled to access it.
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Friday, December 18th, 2020 AT 8:21 AM (Merged)
Tiny
KOUNTREEMALLORY86
  • MEMBER
  • 1 POST
  • 2009 GMC SIERRA
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
My AC and heat only blow through my vents. I can control everything else but where it comes out of. Is that what needs to be replaced and if so where is it located?
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Friday, December 18th, 2020 AT 8:21 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon, I attached the picture and procedure for you. It is under the dash on the left side of the heater case. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Friday, December 18th, 2020 AT 8:21 AM (Merged)
Tiny
BWK
  • MEMBER
  • 2 POSTS
  • 2009 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 119,500 MILES
Are there four actuator's? There is a diagram on your sight that shows four actuator's I wanted to make sure this is correct. Thank you for your time.
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Friday, December 18th, 2020 AT 8:21 AM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
If you have dual temperature controls there are two blend door actuators.
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Friday, December 18th, 2020 AT 8:21 AM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
If your talking about the other actuators as well you have a recirculation actuator and a mode door actuator.
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Friday, December 18th, 2020 AT 8:21 AM (Merged)
Tiny
BWK
  • MEMBER
  • 2 POSTS
I have dual temperature control. Where are the two actuator's located? Thank you again.
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Friday, December 18th, 2020 AT 8:21 AM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
There both bad? That is highly unusual that they both would fail at the same time. What is the issue your having?
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Friday, December 18th, 2020 AT 8:21 AM (Merged)
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
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Here is the location of all 4 actuators.
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Friday, December 18th, 2020 AT 8:22 AM (Merged)
Tiny
KGKINC
  • MEMBER
  • 2 POSTS
  • 2005 GMC SIERRA
  • 14,800 MILES
Replaced failed blend door motor. Motor only operates in one direction and will not move again no matter where temperature control for left side is set. I may not have the proper initialization instructions. Left side blows cold air only, no warm air selection.
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Friday, December 18th, 2020 AT 8:22 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you check to see if you could move the door freely before installing the new one to be sure there is not an obstruction?

Roy
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Friday, December 18th, 2020 AT 8:22 AM (Merged)
Tiny
KGKINC
  • MEMBER
  • 2 POSTS
Both defrost lever and blend door (white) control move freely.
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Friday, December 18th, 2020 AT 8:22 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Hook up the motor out of the dash and see if it moves both directions on command.

Roy
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Friday, December 18th, 2020 AT 8:22 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It may be on the bottom of hvac on or center by pass side there are two different types of hvac Delphi and Visteon so they may be a little different.
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Friday, December 18th, 2020 AT 8:23 AM (Merged)
Tiny
MCGML
  • MEMBER
  • 1 POST
  • 2005 GMC SIERRA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 141,000 MILES
Changed the blend door actuator below the glove box but I still get hot air on one side and cold air on the other. Not sure what the issue is.
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Friday, December 18th, 2020 AT 8:23 AM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi MCGML,

Do you have dual temperature zones? Meaning can you adjust the driver and passenger side to different temperatures? Also, which side is not correct for the temperature selected? When set to cold which blows hot?

I am assuming you have dual temperature zone because this would make the most sense. If so, you have two air temperature door actuators. One for each side.

Let me know and we can go from there. Thanks
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Friday, December 18th, 2020 AT 8:23 AM (Merged)

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