ok I have a 2004 525i, the a/c used to work fine but the last few days when I turn it on the car makes a weird humming noise, it only happens when the ac button is pushed if I have the fan/heater on without the ac the noise isn't there but soon as I push the button the noise will start. if I let the car warm up some an drive a lil then try turning on the ac the noise wont happen an the ac will blow cold but if im sitting still an turn it on the ac don't really blow cold an it makes the noise almost as if the ac is running hard or something?
Moved to the model specific sub-forum.
Good luck with the fix with your a/c!
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