I've said it before, and I'll say it again. Buy an Infrared Thermometer. They aren't that expensive, and you won't believe how handy they are. You can aim at the thermostat housing and see exactly what temp the engine is at.
Why the heck should ANY of these guys around here do ANYTHING that requires common sense? An infra red thermometer is what, a whole 20 bucks? Why in the WORLD would anybody have to spend any money on anything? Someone should just wave their magic wand and solve his problem.