Primary Heating System

Module And Controls:

Module Airflow:

Mode Airflow Distribution:

The base heater system provides heating, ventilation, side window defogging and windshield defrosting. Outside air is drawn from the plenum at the base of the windshield into the heater module (1) by the blower motor fan (18).

Within the heater module (1), the air is heated as required and then routed through ducts to the proper outlets for discharge into the passenger compartment.

A control (2) in the instrument panel allows the operator to control blower motor speed, mode of operation and the temperature of the air coming from the heater system.

The heater module (1) contains components that heat the air flowing through it and direct the air to the proper ducts and outlets. The heater module (1) is a single unit, including the blower motor (6), that is mounted to the rear surface of the dash front panel in front of the instrument panel.

Hot coolant from the engine's cooling system is directed through the heater core (14) and returned to the cooling system when the engine is running. The heater core (14) transfers heat from the coolant to the air passing through the heater core fins. There is no hot water shut off valve in the heater system to prevent flow of coolant through the heater core (14).