Edit: meant to put 3-4 minutes not 3/4
In: Engineering
Car heater uses waste heat from the engine coolant. The engine is large and there’s a large volume of coolant in the water jackets of the engine.
The engine has to heat it’s self, which heats the coolant, which is moved by the water pump to the heater core, a small radiator in the climate control duct.
Once the engine is at operating temperature the thermostat (physical variable valve, opens up with increasing temp) will open and begin moving the hot coolant to the radiator where the coolant is cooled by airflow, the cooled coolant then flows back into the engine and the circuit continues.
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