Your car’s heating system is powered by a small part called the heater core. The heater core pulls in some of the hot radiator fluid coming from the engine and passes it in front of a fan, sending the heat it’s carrying through air ducts, through the cabin air filter, and into the car’s cabin. Fans inside the cabin then help to circulate the warm air generated by the core throughout the passenger areas in your car.
Your car’s heating system is inextricably linked to the cooling system on your car. Ideally, your engine’s temperature is constantly, carefully controlled by a built-in thermostat that regulates the coolant flow through the radiator to keep the engine running, while maintaining the optimal cabin conditions using in-cabin sensors.