A small water-to-air radiator-like heat exchanger that provides heat for the passenger compartment.
A water-to-air heat exchanger that provides heat to the passenger compartment airstream. Hot coolant from the engine circulates through the tubes in the heater core.
A heater core is a radiator like device used in heating the cabin of a vehicle. Through the use of heated coolant from the vehicle's engine, the heater core puts out heat that is then blown into the passenger compartment of the vehicle.