Heater System
The heater system provides heating, ram air and power ventilation and windshield defrosting. Outside air is drawn from the plenum at the base of the windshield into the heater module by the blower fan. Additional outside air, called ram air, is forced into the heater module by the forward movement of the vehicle. Within the heater module, the air is heated as required, then routes through ducts to the proper outlets for discharge into the passenger compartment. A control assembly in the instrument panel allows the operator to control blower speed, mode of operation, and temperature of the air coming from the heater system.The heater module contains components that heat the air flowing through it and direct the air to the proper ducts and outlets. These components are enclosed inside a two-part housing. The front housing mounts to the front of the cowl panel in the engine compartment. The rear housing mounts to the rear of the cowl panel in the passenger compartment under the instrument panel.
Auxiliary Heater (C36)
An optional floor-mounted heater provides heating to the rear of the vehicle. This unit operates independently of the standard heater, and is regulated through its own control on the instrument panel. This system consists of a separate heater core and blower fan.
Heater hoses extend from the unit to a vacuum operated water valve where they connect to the standard heater hoses.
A three-position vacuum operated water valve, cuts off coolant flow in the OFF position, eliminating radiant heat, and reduces coolant flow in the LO and MED positions.
Blower Switch
The three-speed blower switch (LO-MED-HI) is located in the instrument panel, above the radio. In addition to controlling blower motor speed, the switch also triggers an electro-mechanical valve to control coolant flow to the auxiliary heater core.
Blower switch and valve positions are:
- OFF-Valve closed
- LO-Valve open
- MED-Valve open
- HI-Valve open