Fresh Air Ventilation - Jeep J-10 Series 1982 Technical & Service Manual

30-2 HEATER
HEATER AND DEFROSTER OPERATION
The heater is part of the engine cooling system and
depends on normal engine operating temperature and
airflow through the cowl fresh air intake to heat the
interior of the vehicle. During heater operation, close
the fresh air vent.
The air control knob operates a door in the fresh air
intake duct which allows air to enter the heater housing.
When the knob is pushed in, no air will enter the heater.
As the knob is pulled out to the first position (Heat), the
door opens, allowing airflow to the heater. The air con
trol knob must be pulled to the Heat position to operate
the heater.
The temperature control knob operates the blend air
door in the heater housing (fig. 3D-2). At the full out
position, all air is directed through the heater core, pro
viding maximum heat flow. At the full in position, all
air is directed around the heater core, providing un-
heated fresh air. Any in-between position of the control
allows a blend of cool, fresh outside air and heated air.
The defrost control knob must be pushed in for the
DEFROSTER
NOZZLE
blended air to enter through the floor heat duct. When
the defrost control knob is pulled out completely, all
airflow will be directed through the defroster hose and
onto the windshield. Any in-between position of the
defrost control divides the airflow between the defroster
hose and the floor heat duct.
If additional airflow is required, the blower motor
should be operated at one of the three available speeds.
FRESH AIR VENTILATION
The fresh air ventilating system directs outside air
through the air inlet to a door in the left end of the air
inlet to provide air to the driver's side and also through a
door on the right side of the heater to provide air to the
passenger side. These doors are cable and linkage con
trolled. When the air control knob is pulled all the way
out to the vent position, the driver's vent door is opened
by linkage on the air inlet and the passengervent door is
opened by a cable that is attached to the linkage on the
air inlet. When the air control is pushed in, no air will
enter the vehicle.
HOSE
HOUSING
8120OA
Fig. 3D-2 Heater and Defroster Components