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May be regular recalibration of duct valves (more) (archive)
[ Follow Ups ] [ 3-series (E46) Message Board ] [ Msg. Board FAQ ]

Posted by artie on December 28, 1998 at 16:54:55:

In Reply to: Humming noise at starting posted by Paul B on December 28, 1998 at 12:22:35:

I don't know it this is the cause, but like the previous E36's, the E46 has a sort of calibration cycle for the valves in the heating and cooling ducts. They will open and close in order to recalibrate themselves. This happens every once in a while and is described in the owner's manual.
Alternatively, I have heard a high pitch, low volume whine at times - but ususally in times of very high humidity. I believe this is also related to the environmental system and my be used to decrease the humidity levels. In any case, if everything works, don't worry about it.

Artie



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