I have recently bought an 1987 190D and the HVAC issues are driving my crazy. The temp wheel does nothing, directional buttons do nothing, lights do not work and side vents broken. Blower works. Heat only wafts out the defrost and side vents. A/C woks, sort of. It blows from the center vents only and someone has put a switch on the dash that turns the compressor on. I have no idea where to start. Any pointers? There seems to be a lot of W124 info but not so much w201.

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1987 190DT, clackity clack
90 Mustang track car
95 Lightning

1 word advice: junkyard

just get one from a local junkyard, they should work

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1987 Mercedes Benz 300D Turbo Black/Black

Get one "what"?

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1987 190DT, clackity clack
90 Mustang track car
95 Lightning

switches (center HVAC button module) easy to remove, and only has two connectors. it all routes through that one box

I may have a spare somewhere in my garage, can't remember

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1992 850i 6 speed
1991 M3 S54B32 swap
2007 328iT/6 RWD sport wagon
1987 325E 330iZHP engine swap
2004 Vespa 200GT
1976 W115 240D getting a much bigger engine. 5.5L
1997 R129 SL600 5AT

I am assuming that gas and diesel ones are the same. Is it locacted behind the buttons? I will be going by the wrecking yard on thurs. Do the side vents pop out pretty easily?

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1987 190DT, clackity clack
90 Mustang track car
95 Lightning