System Controls - Jeep J-10 Series 1982 Technical & Service Manual

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3D-1
HEATER
CfairokM-Wigonear-Truck Heater
SECTION INDEX
Page
3D-6 CJ and Scrambler Heater
Page
3D-1
CJAND
SCRAMBLER HEATER
Blower Motor
Control Cables
Defroster Duct
Fin Control Switch
Fresh Air Intake Duct
3D-4
3D-4
3D-5
3D-4
3D-5
GENERAL
The blend-air type heater and defroster system is used
on all CJ and Scrambler vehicles. The blend-air method
of heating uses a constant flow system with engine
coolant continuously flowing through the heater core.
The temperature of the heated air entering the passen
ger compartment is controlled by regulating the quan
tity of air which flows through the heater core air
passages, then blending it with a controlled amount of
cool, fresh air which bypasses the heater core. System
controls and operation are described in this section.
X r.rr
[WIPERS WASHER!
Fig. 30-1 Huttr and Defroster Controls
Fresh Air Ventilation
General
Heater and Defroster Operation
Heater Core
System Controls
3D-2
3D-1
3D-2
3D-4
3D-1
When servicing a malfunctioning heater system, refer
to the Service Diagnosis for a list of the possible causes
and recommended service procedures.
SYSTEM CONTROLS
The heater and defroster controls consist of a fan
control switch and three push-pull knobs and cable as
semblies which are located on the instrument panel (fig
3D-1).
The air control is a dual function control. When the
control is pulled to the first position (Heat), it opens a
door in the fresh air inlet to allow air to enter the heater.
When the control is pulled completely out (Vent), it
opens two additional doors (one in the left end of the
fresh air inlet and one on the right side of the heater) to
allow fresh air to enter the passenger compartment. A
new fresh air duct has been added to direct fresh air to
the driver's side.
The defrost control knob operates a door in the heater
housing which regulates heater and defroster operation
by directing the flow of air through the defroster hose or
floor outlet.
The temperature control knob adjusts the amount of
airflow around the heater core and through the heater
core air passages. This regulates the degree of heat en
tering the passenger compartment.
The fan control is a four-position control switch (Off,
Low, Med and High), which regulates the blower
motor and airflow for heat and defrost.