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Are you sure it's not a electrical problem with the gauge? Possibly reacting to the load of the blower fan? I would put a real temp gauge on it from the store before worrying about it, unless you have other signs the engine is really getting hot.
Make sure you have a good solid ground connection between the engine block and the body. If you have the factory oil pressure gauge, check to see if its needle goes up with the heater blower on.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
