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That is a thermostatic fan switch or temperature switch, not a thermostat. That is why I didn't understand what you were saying. The Humvee has only one thermostat, and it is in the coolant flow.

Are you talking about the time delay module bu the washer fluid tank? It is a solid state relay. The thermostat is round and at the end of the big rubber hose coming from the top of the radiator. It is inside the silver housing that the hose hooks to. It opens when hot to let water flow...

The thermostat controls water flow. It isn't electric. How would a bad thermostat cause the fan to come on at high RPM? other than the engine getting hot?

Could it be just a faulty wire? maybe a grounding issue? I remember back in high school, some guys that didn't know how to install amps and subs, would get a whine in the speakers that got higher as they gave more throttle. Sounds similar.