I am replacing the vacuum unit in my dash board. any suggestion on what else to check or replace while my dash is off the car right now?? thanks

I would replace every bit of rubber vacuum line in there. Your evaporator is probably covered in dust and debris, and there won't be a more convenient time to clean it. Actually, it wouldn't be a bad idea to clean out the ducts and evaporator box too. Could you take some pictures for everyone?

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1982 300D, black w/ palomino leather, 203K
2001 E320, champagne, 105K (Mom's)
1999 Dodge Dakota, squeaky & battered, 142K

Also may want to replace the foam on the defroster flap so that it will stop blowing little foam bits randomly(at least my SD did...).

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83 300SD.......sold
96 integra SE....sold
99 a4 quattro....sold
2001 IS300.......sold
2002 330i.........current.
2004 highlander limited....current.

I Will definitely take lots of picture of what's behind the dash and report back in a few days..thanks for ideas

here are some ramdon photos of my car including inside of the dash board.
if anyone wants me to take a specific image for parts identification purposes. pm me or email me and i'll try to post it. i am doing lots of work on this car so i'll try take as many photo as possible.

http://pg.photos.yahoo.com/ph/mazzy_1234/album?.dir=4519&.src=ph&store=&prodid=&.done=http%3a//pg.photos.yahoo.com/ph/mazzy_1234/my_photos