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Illustrated: Cooling System Thermostat
Illustrated: Cooling System Thermostat
Thermostat: The thermostat's main job is to allow the engine to heat up quickly, and then to keep the engine at a constant temperature. It does this by regulating the amount of water that goes through the Radiator. At low temperatures, the outlet to the radiator is completely blocked all of the coolant is re-circulated back through the engine.
Once the temperature of the coolant rises to between 180 to 195 F, the thermostat starts to open, allowing fluid to flow through the radiator. By the time the coolant reaches 200 to 218 F, the thermostat is open all the way.

The secret of the thermostat lies in the small cylinder located on the engine-side of the device. This cylinder is filled with a wax that begins to melt at around 180 F (different thermostats open at different temperatures, but 180 F is a common one). A rod connected to the valve presses into this wax. When the wax melts, it expands significantly, pushing the rod out of the cylinder and opening the valve.
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