Yes Jeff, the clutch engaged while I was driving, I noticed it because of a whirring noise. It was below freezing out when this happened and I was on the ECON setting. The clutch then disengaged for a short while after my next drive but then engaged again erratically. It was still engaged when zero (off) button was pushed, so I removed the connector at the pump as a quick fix. I'll take your pointers and try checking the switch, pressure etc. I hope its not the MAS relay, since its about $470CAD to replace.

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Ian Read
90 300TE4MATIC (124)
79 300SD (116)