If you get nothing at all, check the CC fuse in the fusebox (don't remember the number). Probably cracked -- this will get you no fan, and only heat out the defrost vents while driving.

If everythings works but the fan, the most likely cause is a blown strap fuse in the little "coffin" next to the fuse box.

Heed Larry's advice about the aux pump -- I have to test mine, the CC in the TE has gone crazy (constant variations in blower speed, funky temp control, and the solenoids clatter constantly).

Peter

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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!