I've read through the manual pages. The basics are the same, but the system in my car ('87 260E) is "upside down" from the system used to illustrate the manual. In mine, the airflow is "top down" and moves the flap down with increasing airflow. In the manual, the flow is "bottom up" and moves the flap up with an increase. Lots of excellent information on how the silly thing works & what modifies what signal.

Very useful.

Thank you,

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Norm in NJ
Next oil change at 230,000miles