I was afraid you were going to say that...

Get a used one, it's not worth messing about getting it to work "manually" when for $75 you will likely have complete climate control instead.

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!