wow, thanks for all of the help

i had all of the vacuum elements checked out and replaced a couple years ago so i know the a/c works the way it should.

i didnt know it automatically adjusts the amount of fresh air for what is needed, i figured it was always 100% fresh air unless you pushed the button. so i really dont need to use the button, ill still have 80 recirc air, which sounds pretty good to me.

so now i know, and knowing is half the battle...

thanks alot also for the great picture, ill have to save that one

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350