2001 BMW 330 Whistle

Tiny
FAST_EDDIE14US
  • MEMBER
  • 2001 BMW 330
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 119,000 MILES
Have a very irritating noise when the a/c - heat fan is on the lowest or nest to lowest setting. Have switched to a new cabin filter with no success. It is clearly audible even when the radio is on at a moderate level. Anyone have any ideas? Possible a bearing is going out in the fan? Or?
Sunday, July 25th, 2010 AT 9:27 PM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,603 POSTS
It might be several things. The final stage module unit sends a pulse width modulated speed signal to the fan motor, and I have seen that module cause the fan to make noise. It might well be the fan. There might be a noise from the expansion valve. I also feel compelled to point out that cyberspace is not good for noise diagnosis, I cant hear what you hear, if you get what I mean.
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Monday, July 26th, 2010 AT 4:14 AM

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