Cherokee - Wagoneer - Truck Air Conditioning - Jeep 1979 CJ-5 Technical & Service Manual

AIR CONDITIONING 3E-25
N O T E ; It is not necesary to discharge the system to
service the blower motor. The evaporator housing may
be lowered from the instrument panel to gain access to
the blower motor attaching screws.
Installation
(1) Push hoses through grommet opening, and in-
stall grommet by pushing toward engine compartment
of vehicle and fasten to dash panel- with two attaching
screws.
(2) Raise evaporator and install evaporator-hous-
ing-to-instrument-panel attaching screws and the evap-
orator-to-mounting-bracket screw.
(3) Install hose clamps and grommet attaching
screws.
(4) Connect receiver/dryer-to-evaporator hose.
(5) Connect inlet (suction) line to compressor.
(6) Evacuate, leak test, and charge system.
EXPANSION VALVE SERVICE
The valve is preset and should not be adjusted. A
defective valve requires replacement.
, (1) Discharge system.
(2) Remove evaporator housing assembly.
(3) Remove insulation wrapped around suction line
and expansion valve. Mark capillary tube location on
suction line.
(4) Disconnect inlet and outlet connections, ca-
pillary tube clamp, and equalizer tube.
(5) Remove expansion valve.
(6) Clean suction line to provide a positive contact •
with replacement expansion valve capillary tube.
(7) Connect inlet and outlet hoses. Clamp capillary
tube at marked position and connect equalizer tube.
N O T E : Clamp capillary tube securely so that a firm
contact with the suction line is formed.
(8) Wrap expansion valve and line with insulation.
(9) Install evaporator housing assembly.
(10) Evacuate, leak test, and charge system.
C H E R O K E E - W A G O N E E R -
T R U C K A I R C O N D I T I O N I N G
Page
Evaporator Housing Assembly 3E-27
Expansion Valve Service 3E-Z7
General 3E-25
Page
Condenser and Receiver/Dryer Assembly 3E-26
Control Operation 3E-26
Control Panel 3E-26
GENERAL
When driving at normal highway speeds the Jeep air
conditioning system will provide maximum efficiency.
However, when operating under stop-and-go city driving
conditions a slight reduction in cooling efficiency gener-
ally will be experienced.
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.
The air conditioning system, as shown for the Wagon-
eer in figure 3E-20, is applicable to Cherokee and Truck
models.
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.
A D J U S T A B L E A I R
O U T L E T L O U V E R S
Fig. 3E-20 Air Conditioner—Cherokee-Wagoneer-Truck Models