Yeah, the clutch on the pump only engages for a minute or so during warm-up. Then the pulley just freewheels without turning the pump - just like the AC clutch. My 6-cylinder only has one belt; so I just umplugged the wire to the clutch. There's a connector under the coolant bottle.
Also, there is a valve in the air line behind the pump that opens via a vacuum line when the pump engages. I plugged the vacuum line to keep the valve closed all the time, just in case the reverse check valve (also in the air line) failed.

DG