[MBZ] '92 300E AC compressor in '87 300TD?

[Jim Cathey]

> What does the speed sensor do?

Tells the system the RPM of the compressor.
Used by the serpentine belt protection system
to detect a locked-up compressor, which disengages
the clutch to protect the (single) belt, in theory
keeping the water pump going thus protecting the
engine from destruction.

> Do '83 300D Turbos have them?

No; no serpentine belt: no speed sensor.  (Though it wouldn't
hurt to have one on the compressor, it just wouldn't be used.)

> Are they part of the compressor?

Yes.

-- Jim