I don't have my HVAC paper manuel in front of me, but I think the pod directly behind the glove box is outside air. The white lever does not sound familar, I'll look when I get home.

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DO IT RIGHT THE FIRST TIME, DON'T BE A HACK
Political Correctness is NOT part of my vocabulary
and finally FIGHT CRIME...SHOOT BACK

'82 240D Stick
'85 300D Auto
Drove my first MB at age 16 1960 300SL W190