The water crossover has a fitting connected to the inlet hose of a heater core in the passenger compartment (refer to Figure 4-8). The heater core is a heat exchanger assembly of finned metal tubing connected to end tanks.
Airflow caused by the operation of the heating system blower motor removes heat from the coolant flowing through the heater core.
The heater core has a steady flow of coolant heated by the engine at all times, since no restrictor or control valve is used (see Figure 4-9). The outlet of the heater core connects to a hose and fitting on one end tank of the radiator.