Buried deep under the dash of a 1985 126 300SD is a "mysterious" box,
the purpose of which, as I understand it, is to
properly direct heating and cooling air flows based on instructions
from the climate controller. Do you know of such a box,
and if so, what is its proper name and what does a new one cost?
Have you the ACC with the little translucent AUTO switch, or
the big square AUTO switch? They're different. The former
(older) has three main components, plus a vacuum valve block.
Temperature regulator, blower speed regulator, and the pushbutton
array. The latter has the three parts integrated into the
pushbutton array. The problems lie 90% in the pushbutton
array, at least so I've seen.
To which you add all the vacuum pods, the monovalve, auxiliary
water pump and AC compressor, etc.
-- Jim
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