Testing an Engine Thermostat using a Heat Gun

Testing an engine thermostat using a hot air gun to open and close the valve. A vehicle's thermostat performs two main functions in the cooling system. It helps the engine to heat up to its optimum temperature as quickly as possible and then also to keep the engine at its optimum temperature. This type of thermostat regulates the flow of coolant to the air-cooled radiator. The thermostat uses a chamber that contains a wax pellet, which melts and expands at a set temperature. This expansion operates a rod that then opens the valve when the preset temperature is reached, allowing more coolant to flow through the radiator. The operating temperature is determined by the composition of the wax. Thanks for watching.
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