Mit Klima, or Sans Klima? If it has Klima, that is where you start.
Klima relay fails often.
Otherwise, I'd start at the plug closest to the clutch. Likely if you
have voltage there when the clutch should be engaged, the clutch coil is
bad. If no volts there, every case I have encountered has been a Klima
relay gone over the hill.
Karl Wittnebel via Mercedes wrote on 10/19/19 9:33 PM:
OK hypothetically if I needed to pull the climate control signal for the
A/C compressor clutch off a euro 123 wagon control unit, where would I
begin looking for the signal?
WDB 123 193 120 14388
It is the older style unit with the vertical buttons in the middle. I guess
I need to do some reading on how these control units typically fail and how
to test/troubleshoot them.
This motor is from a 2006 320 cdi, so it is a bit of a hybrid.
Thanks,
Karl
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