Thanks.  That is how I marked it in my file.  but I wanted to check.

This is for OM603, which I believe is a Nippondenso compressor from the factory.
Max Dillon
Charleston SC
'87 300TD
'95 E300

On July 17, 2015 11:42:25 PM EDT, Curly McLain via Mercedes <> wrote:
This is for the Japanee compressor?  I assume not for the GM in the

Here's the troubleshooting info for the clutch coil, either read ohms
amps depending on your test equipment.  This was copied from the MBCA
forums before they effectively killed it.  I met Bob Goodwin a few
retired Navy and a great guy.

"There is one thing that I don't believe is covered as well as it
should be
and that is the clutch coil. Yes, the clutch coil. Famous for burning
shorting out or just frying a few windings. Not enough to blow the
fuse but
plenty to disrupt the speed comparator and shut off the compressor
permanently or intermittently.

Of all the troubleshooting steps, checking the compressor clutch coil
cheap and relatively easy. Measure current with a clamp on amp meter.
Reading should be 3.75 A hot or 4.2 A cold. Resistance should be
approx 3.5
ohms hot or 3.1 ohms cold.

Everytime I chased an elusive A/C compressor problem in a Mercedes, it
turned out to be a bad clutch. I don't spend near as much on A/C parts

 >>Robert Goodwin


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