Cj Air Conditioning - Jeep 1979 CJ-5 Technical & Service Manual

3E-22 AID CONDITIONING
CJ A I R C O N D I T I O N I N G
P i l l
Condenser and Receiver/Dryer Assembly 3E-23
Control Operation 3E-22
Control Panel 3E-22
GENERAL
When driving at normal highway speeds the CJ air
conditioning system (fig. 3E-16) will provide maximum
efficiency. However, when operating under stop-and-go
city driving conditions, a slight reduction in cooling effi-
ciency generally will be experienced.
F A N C O N T R O L T E M P E R A T U R E
KNOB C O N T R O L KNOB
A D J U S T A B L E A ! R
O U T L E T L O U V E R S
Fig. 3E-16 Air Conditioner—CJ Models
It is recommended that intermediate temperature and
high fan setting be used for average city driving and
intermediate temperature and medium fan setting for
highway driving.
When driving at relatively high speed for an extended
period of time, the cooling coil may possibly frost over,
resulting in a temporary loss of cooling. Should this
occur, simply turn the TEMP knob to OFF and allow the
blower to operate for a few minutes to allow the cooling
coil to defrost. Then turn the TEMP knob to a setting
which is not as cold as the setting at which frosting
occurred.
To maintain maximum cooling efficiency, periodically
remove bugs and foreign matter from the condenser and
radiator fins. DO NOT install a bug screen or other
screen material in front of the condenser and radiator.
Water forming under a vehicle, at a point below the
cooling case, is condensation water draining from the
system and is considered normal.
The engine temperature gauge pointer will indicate a
slightly higher than normal temperature when the air
conditioning system is operating. However, should ex-
cessive overheating occur, check the condition of all wa-
ter hoses, check the radiator for rust or scaling
Page
Evaporator Housing Assembly 3E-23
Expansion Valve Service 3E-25
General 3E-22
conditions, and make sure that the condenser is free of
bugs or other foreign matter.
The air conditioner also can be used for fast, efficient
defogging of windows during cool, damp weather.
The condenser is mounted ahead of the radiator and
t h e r e m a i n i n g c o m p o n e n t s a r e in t h e e n g i n e
compartment.
The compressor is a two-cylinder, belt-driven pump.
An electromagnetic clutch couples the compressor to the
drive pulley. The drive pulley freewheels when the air
conditioner is not in use.
The start position on the ignition switch automat-
ically disconnects all accessories, including the air condi-
tioner, to reduce battery load and provide easier
starting.
CONTROL OPERATION
For fast, maximum efficiency, purge the vehicle of hot
air by driving the equivalent of two or three city blocks
with at least one window open. During this time, place
the TEMP control in the MAX position and the FAN
control in the HI position. This permits the evaporator
to precool in hot weather.
Adjust the air outlets to obtain desired airflow distri-
bution by moving the louver levers left, right, up, or
down. Airflow can be adjusted for quick delivery to a
specific spot or for gentle diffusion of air throughout the
vehicle.
When the interior of the vehicle has cooled to the
desired temperature, the FAN knob may be set to obtain
the desired volume of air from the air outlets. The
TEMP knob may be rotated to vary the temperature. It
may be necessary to experiment with the TEMP knob to
determine the settings best suited to various driving
conditions. Generally, an intermediate temperature and
high fan setting is comfortable for city driving, and a
lesser fan setting comfortable for open road driving.
Run the engine well above idle speed for more ef-
ficient cooling under conditions in which the system is
operated with the vehicle standing.
CONTROL PANEL
Fan Switch
The fan switch may be serviced by removing the ac-
cess plate located on the lower evaporator core housing
below the control panel.