Question about 2001 GMC Yukon XL

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No air blowing out front vents,, back vents only...

Which a/c fuse is too control vents..

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Not a fuse issue. Likely blend air door actuator failed or vacuum leak.

Posted on May 01, 2015

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Sounds like your heater coolant hose door flap is broken or loose. May want to check behind the heater controls, if your components are mechanically operated. If electronically, may need to perform more troubleshooting before replacing this component.

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Could be one of two things, HVAC needs to recalibrate itself or one of the blend doors (or its actuator) is stuck. To accomplish the recalibration, set all HVAC controls and switches to their OFF or CCW positions, pull fuses # 36 and 39 in the rear fuse panel, wait about a minute then reinstall fuses. Do not touch any of the HVAC controls for 2 -3 minutes. If this does not resolve the vent issue, you will need to have the HVAC diagnosed by a technician.

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1 Answer

The air has been blowing cold for a long time then the other day it stopped blowing out the front vents. I don't have the owners manual so I need to know the fuse and relay diagram.

sounds like vacum leak you may need to replace heat and air controls on dash or the hoses on back of control may be loose also check hoses under hood that go from engine through firewall may be cracked or just loose

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can't help you w/ fuse panel diagram-- but it may be your front blower motor door. sometimes they stick in the closed position. good luck!!

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1 Answer

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Hope I was avle to help, glad you up and going.

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