1. My air vents seem permanently stuck in the "put everything on the windshield" mode. The center vents get no air conditioning and no heat. It all gets defrosted.

Is this the "monovalve"? Is this a "dashpot"? What is my problem?

2. My back vent dispenses hot outside air in the summer, cold outside air in the winter. I know it's an odd part of the car... based on that information, does anything require repair?

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL