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GMC Thermostat maintains the engines at the optimal range of temperatures, conserving power and reducing combusted fuel. GMC was founded in 1901, and it developed its reputation on trucks that endure severe loads but make it through the urban streets with the air of calmness. Stout boxed frames blend with powertrains that are full of torque such that drivers pull trailers, move gravel or carry weekend toys without breaking a sweat. Hitch guidance, surround vision and a flipping, folding and propping tailgate make large rigs easy to move around in narrow parking spaces. Triple-sealed doors, hydraulic body mounts and tuned springs subdue road noise, allowing playlists and conversation to prevail over wind and tire noise. GMC continues to refine each generation and makes every platform pass a vile test loop, which ensures that reliability only increases rather than resting. A Thermostat next to the radiator detects the temperature of the coolant, then switches open or closes its valve to divert or suppress the flow of fluid to the block or withholds it, maintaining a constant target temperature of 195 degrees to keep combustion sharp, oil slick, and aluminum heads free of thermal bending during the bumper-to-bumper crawls or completely open throttle runs. Since the Thermostat is operated under a tight feedback loop, it responds to changes in temperature within a few seconds, protecting fuel economy and throttle response not only during a cold, dawn start, but also when overtaking in the desert.