I just bought my first mercedes, a 300sd 1981, 122,000 km.

None of the function (defrost, bi-level, normal) are working. Hot air come out only by the side vent air outlet. I haven't tried the ac yet, to cold in Quebec.
Ambiant temperature raise to a confortable level.
Blower is working only at high speed.

Will soldering the climate control panel solve the problem?
Or could you direct me to other thread that could hepl me?

The car came with a Chilton manual with not much in it. Is the Bently a better one?

Thanks for all
Yves