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
>>Virginia Beach, Virginia
>>'87 300SDL
>>'95 E300D


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