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The thermostat has an off-center positioning...sort of like a fried egg...and the housing has a beveled bottom. I figured that the thermostat needs to open on the lower end or it will hit the sensor prong, preventing the thermostat from fully opening. Not sure this is true, but if it is, this would cause the engine to run hotter than necessary. There is a little "air valve" at the 'top' of the thermostat (as it should be placed when installing) that indicates to me the proper positioning of the whole unit. Again, the frikkin' book says nothing about this. But by observing the sensor's placement (top of the thermostat housing) and the thermostat itself, this is what I concluded. I positioned it in the way that made the most sense.
Look at the temperature sending unit, and see if it looks new, or if the rebuilder simply put old ones back.