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Ditto--couldn't have said it better myself (more) (archive)

[ Follow Ups ] [ 3-series (E46) Message Board ] [ Msg. Board FAQ ]

Posted by Steve on December 29, 1998 at 08:15:29:

In Reply to: May be regular recalibration of duct valves (more) posted by artie on December 28, 1998 at 16:54:55:

My 98 E36 makes these sounds as-well. It is explained in the reply below and your manual.

98 E36

: 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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