I just purchased a used 2004 IS300, and i didn't realize it at first, but there is a high pitched whine coming from the right side of the cabin, close to the glove box. The whine comes on when i turn the fan on every setting other than full blast. The air conditioner does not affect the noise. I think it might be the electrical resistor that alters the fan speed. Has anyone had this problem before? or anyone have any ideas, it is getting really annoying. Thanks.
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listen to the noise as u change the speed of your fan it will probably change with the fan speed. 99% of the time its the blower motor located right behind your glove box. its held in by 3 8mm screws behind/below your glove box.