Chirping noise floor/feet vent

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Deligh

TYF Newbie
Joined
Apr 23, 2014
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09 Tahoe- just started using the heat a few days ago and when the heat is on and set to blow out of the floor/feet vents it chirps and sounds like a cricket on the passenger side. The noise gets higher pitched the faster the fan speed. Anyone have any suggestions on what to look at?
 
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