Upper dash as in defrost vents? Check your vacuum connections. My 1979 Lincoln was the same way, when the vacuum hoses broke, it only blew air through the defroster.

P. Valdez

1998 VW Jetta TDI
1.9L I4 direct injection turbo diesel
5 speed manual
no mods, no money

AIM:PackRatTDI

My exhaust smells better than yours.