Why does the defroster vents only work no matter what setting the selector is set to?

140

Asked by Dec 23, 2013 at 09:55 PM about the 2001 GMC Yukon XL 1500 SLT 4WD

Question type: Maintenance & Repair

No matter cold or hot, the air only blows through the defroster vents, no matter which
setting is selected.

5 Answers

111,155

Sounds like you mode door actuator needs replaced.

2 of 2 people found this helpful.
111,155

I believe your model has three ac/heater door actuators . 1) is for mode door 2) is for blend door 3) is for recirculate door

2 of 2 people found this helpful.
67,475

Check for a broken or disconnected vacuum hose coming from the intake manifold. If the system loses vacuum for some reason it defaults to defrost for safety reasons. HTH. -Jim

2 of 2 people found this helpful.
111,155

http://www.heatertreater.net/videos.html#chevy --- check this out it may help. There are also several videos on you tube.

4 of 4 people found this helpful.
140

Where do I find the mode door actuators?

14 of 14 people found this helpful.

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