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Discussion Starter · #1 · (Edited)
It’s very annoying, and usually starts after about 10 minutes. Its goes off if I put the heater fans on full blast, but in low speed positions, it starts whistling. The BMW mechanic who listened to it said he wasn’t sure what to check

Any suggestions?
 

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Mine was doing the same thing, then the A/C final stage resistor went bad. Once I changed it, it stopped whistling.
 

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Discussion Starter · #3 ·
MINENCE said:
Mine was doing the same thing, then the A/C final stage resistor went bad. Once I changed it, it stopped whistling.
Actually he did mention this, but dismissed it as he had no idea if it would cause this noise. Thanks for the tip.
 

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My car did the same thing on medium speed. Dealer replaced climate control fan under warranty.
 
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