Question about 2000 GMC New Sierra 1500
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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
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Sep 24, 2011 | 1995 GMC Sierra C1500
First of all get the Freon level checked, if Freon/ refrigerant is low then it can cause this problem.Wen Freon is low it takes time to cool.--- So first get Ac pressure tested.It can be tested at any local car garage.Some times pressure will be checked OK, but still if Freon is getting clogged in the line/ tube then it will not reach the front , but reaches rear then front will not cool, but rear will.--------
But mostly this problem is related to blend door.
If the rear is working well and front is not I would suspect a blend door or actuator issue in the front.Double check and see if you can hear anything moving when you are adjusting temperature from hot to cold.Also check and make sure the air flow moves properly from defrost to vents and floor etc.
Either a bad blend door motor or Climate Control Assembly.
The A/C heater function selector switch combines a vacuum selector valve for
direct control of the vacuum control motors and electrical input to the
instrument cluster module.
The blend door actuator is located behind the glove box.-----
To see blend door diagram for your Yukon Denail, click the link below :---
This will help.Thanks.Helpmech.
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