It's sort of shaped like a "J", 2-3" long and it plugs in behind the glovebox. I am not referring to the aspirator motor. If you tink about it, how can the CCU monitor inside temp without knowing outside temp.

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1995 E420 152k
1991 300D 2.5 348116 daily driver
1992 300E 2.6 196k-work in progress(head gasket)
2002 BMW 745Li 93k