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Discussion Starter #1
Recently on my 05 is 300 the ac fan has been randomly dropping to low (I always run in auto mode) and then back to whatever speed it was at. I didn't think much of it until today, when I got in the car and heard the worst high pitch noise. At first I thought it was coming thru the radio so I checked the antenna wires. At that point I discovered it was actually either the fan it's self or the controller unit. Attached is a video of the car making the sound. I wasnted to get some input before I just start replacing components. Pretty sure the controller is dying. What do you think?
 

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Discussion Starter #4
I apologize. The video won't post on mobile. Ill add it tonight when I get home. The sound is a high pitch squeal. The lower the fan speed the louder it squeals. I've traced the source of the sound to the passenger floor board area. It's also accompanied by what I can only describe as TV channel static intermittently. Possibly the most annoying sound I've ever heard.
 
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