Blend air door actuators

Trailblazen04

Active Member
Im about to replace my actuators and was wondering if theres anything i need to know about before getting them in place and plugging them in. I would adjust the temp by reaching under the dash and moving the knob so i wouldnt mess with the temp controls anymore does it matter what there set to when i plug in?
 

MRRSM

Lifetime VIP Supporter
The Trailblazers may have different GM OEM Part Numbers... but there is enough Good, Generic GM "Know How" in order to R&R these Actuators to make downloading and watching this video from Brian at Briansmobil1 Youtube Channel worth your while:


Please ...Do NOT Be Tempted to install Cheap, Aftermarket Blend Door Actuators if possible...but if you have to be frugal and do so... avoid putting in anything other than the ACDelco or Delphi Real Deal versions in the places with the Hardest Access to perform any R&R.
 
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Trailblazen04

Active Member
So i pulled the hvac b fuse and installed the actuators then reinstalled the fuse and turned the key on but i get no response from the actuators.
 

MRRSM

Lifetime VIP Supporter
If you have the Automatic Style HVAC Dash Control Panel... Try this Re-Calibration Procedure:


If you have the manual Style Dash HVAC Control Panel... Try this Re-Calibration Procedure:

 
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MRRSM

Lifetime VIP Supporter
I edited Post #4 to include the Manual Re-Cal Instructions Video as well...

Visit THIS Link at GMTN...and Follow @Mooseman's Instructions on How to Download a Complete GM Digital OEM Service Manual as 'The Bible' to refer to for more In-Depth HVAC Repair Instructions... and Having a GM Tech 2 would certainly help in all instances of these kinds of repairs:

 
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Trailblazen04

Active Member
Thank you when i get home from work ill mess with it again. Is the fuse i need under or the hood or the under the back seat?
 

MRRSM

Lifetime VIP Supporter
Watch from 21:20 for the Re-Set Procedures:

 

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