Loud Buzzing/Humming Noise Coming From A/C Vents 01 Yukon Denali
mokushi
10-10-2006, 12:16 PM
Hey guys,
This just started like a week ago. When I set the cabin air to recirculate, a really noticeable noise comes from out of the vents. Almost sounds like plastic rubbing at high speed. I think it is the blend door not engaging and disengaging all the way. When I set the air to pull fresh air from outside, the noise quiets down, but you can still hear it if the fan is set to high. It doesn't matter whether the a/c is on or off, it still makes the noise. The noise seems to stem from under/behind the dash near the firewall. Any ideas?
This just started like a week ago. When I set the cabin air to recirculate, a really noticeable noise comes from out of the vents. Almost sounds like plastic rubbing at high speed. I think it is the blend door not engaging and disengaging all the way. When I set the air to pull fresh air from outside, the noise quiets down, but you can still hear it if the fan is set to high. It doesn't matter whether the a/c is on or off, it still makes the noise. The noise seems to stem from under/behind the dash near the firewall. Any ideas?
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