[s-cars] Fresh air recirculation

[Djdawson2 at aol.com]

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Having been through this exercise on my 200 20v, I'm wondering if anyone can
point me in the right direction for my 93 S4.  The car is fogging up on the
interior in cooler weather, and I suspect the recirculation flap is stuck
closed.  On my 200 it was a simple return spring replacement... similar on
the S4?  If so, is located in the same place and use the same spring?
Any info appreciated.
Thanks,
Dave in CO