Can someone please tell a new owner of a thirty year old 350SL what happens to the center vent? For in my case it just blows fresh air all the time... the lever seems to not work... move it left or right same result I have searched other posts but have not found a specific thread. Thank you in advance for any help this site is the best ever. Ernie 1972 350SL 20K miles.

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I love low mileage cars!
1972 350SL 23,000 miles
.......Sold...........
Now 1969 280SL