2001 BMW 330 Whistle

2001 BMW 330
119,000 MILES • 6 CYL • 2WD • AUTOMATIC
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FAST_EDDIE14US
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  • 1 POST
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?
Jul 25, 2010 at 9:27 PM
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DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
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.
Jul 26, 2010 at 4:14 AM
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