Quote:
Originally Posted by thom4782
If anyone has some insights, I'd greatly appreciate hearing them.
When the engine is running and I turn on the AC by pushing the snowflake button, there is a whine that come from front area of the the passenger foot well. I would guess that it is the AC/heater blower fan, but here's the strange thing. The pitch of the whine increases with engine speed and not fan speed.
Some I'm thinking it could be expansion valve noise. Does this make sense to anyone. It's different than the expansion value noise one hears then the refrigerant is low. It's definitely not a wheel bearing because it whines when the car isn't moving. The only way I can get it to start and stop is to push the snowflake button on and off.
So does anyone have a guess as to what else might be causing the whine. I can't think of anything up from that changes pitch with changes in engine speed.
Thanks
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Hi Thom.
It might sound stupid, but make sure the noise is not coming from the speakers.
If the stereo system has a bad ground (or another issue), activation of an accessory can lead to an alternator noise in the speakers.
I know it's a long shot, but just put your ear next to the speaker (dash and door) when you press the button.