Check the fuse for the blower motor (may be in fusebox, may be separate) -- sounds as if your blower isn't running!

It's also possible that the blower speed control unit is bad, but that's unlikely.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!