Good luck in getting the buttons to work properly. Currently I have
to punch the button next to the defrost button to get the fan
running, and then punch the middle or button on its right to get hot
or cold. Spraying the buttons mechanisms with Deoxit improved the
situation but I still have to go through the process of getting the
fan running, and then punching the hot or cold button. I replaced
all three control units with used units from Arizona, which didn't
work at all until I resoldered the button unit. (The original unit
had burnt up while driving; probably because I accidentally punched
two buttons simultaneously). The Arizona units had the same defects.
I suspect that the problem might be in the pushbutton contacts or
the mechanisms that engage one while disingaging another.
Gerry
All good reasons I love the 240D and older cars with the dual heat
manual controls. ACC was a gimmick to sell expensive cars, but is
never allowed separate R and L control, and is always breaking. ($$$$)
My favorite 300D would be a 240D 3.0
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