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Old 11-12-2011, 01:17 PM   #85
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Join Date: Dec 2010
Location: MD, USA
Posts: 1,489
My Ride: 01 330CI 6MT ZSP EU3
Originally Posted by dino71 View Post
Does anyone know what that little box (small connector goes to it) does that is clipped to the top of the fan housing?
A sensor of dirty air that controls A/C air recirculation in 'A' mode (automatic). If your air recirculation button is in 'A' mode it decides where to get air for your A/C - either from outside (no recirculation) or from inside (recirculation).
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