Gunny,
Why don't you just bypass the thermal sensor for your fan & connect it directly to a switched hot wire for the trip. The fan will run alla time but at least you won't overheat. The thermostat should keep the temp up to optimal running temps.
The only other suggestion I would have at the moment is to add an auxiliary fan in front of the radiator. IIRC some members were quite successful in installing a fan (with temp sensor) from a Caravan.
Tom
EDIT:
Here's a thread on the subject (with links to even more threads).
http://www.vehicross.info/forums/sho...fan+conversion
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