Question about 2011 GMC Acadia Denali
No I don't think its the Domino effect at all. I had no problems with the air until I disconnected the battery for a totally different situation. I've read on numerious sites that this is a common problem when the battery has been disconnected. It can't be a coincidence on that many vehicles.
Posted on Jun 30, 2015
Unless you shorted something out, it is most likely the blend door. They are inexpensive enough to just replace , instead of trying to trace wires, that should never go bad. I have a Tahoe, and they are known for blend door actuators going bad. Symptoms = Heat coming out some vents but not others, when on AC, or just outside air is selected. It's not the wiring, but the door actuator itself.
Posted on May 17, 2014
Have to get a wiring diagram at a local repair shop
or buy the factory book from Helm.Com
Posted on May 17, 2014
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Posted on Jan 02, 2017
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
SOURCE: 2002 GMC Yukon XL -
No they do go but not by changing the battery its just whats known in the trade as the dominio effect ,us mechanics are used to it this is where you change one thing and something else down the line goes wrong and the poor old mechanic gets the blame ,I think its just coincidence that the actuator valve has decided to go at the same time as changing the battery ,Dominio effect no doubt you will change the valve and then you will get two punctures at the same time .
Posted on Nov 21, 2010
You will need to register on the forum to see it, but there's a diagram for a 2-door lock on the 6th post down. http://www.tahoeyukonforum.com/forum/showthread.php?t=7452
Posted on May 17, 2011
Tips for a great answer:
Push-pin Fasteners (Qty: 3)
Insulator/Closeout Panel - Left
Procedure Disconnect the electrical connectors.
Caution: In order to avoid actuator damage, DO NOT apply power to the actuator when it is not installed in the HVAC module.
Preliminary Procedure Remove the instrument panel insulator - left side. Refer to Instrument Panel Insulator Panel Replacement - Left Side.
Left Temperature Actuator Screw (Qty: 3)
Caution: Refer to Fastener Caution in the Preface section.
2 N?·m (18 lb in)
Left Temperature Actuator
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