Heater System

The heater system heats air entering the vehicle passenger compartment. The main component of the heater system is the heater core, a small radiator located inside the passenger compartment. Engine coolant is pumped to the heater core directly from the engine whenever the engine is running. The engine coolant transfers heat to the heater core tubes and fins; air passing over the fins on its way to the passenger compartment then absorbs this heat.