1993 DODGE TRUCK air conditioning

•

Fig.
12
Blower
Wheel
(7) Install the 3 arms. Install nut that attaches 3
door arms to doors on the top cover of the unit (Fig.
11).

INSTALLATION
(1) Install the evaporator heater assembly. Plastic
instrument panel may have to be flexed outward.
(2) Install and tighten the screw that retains the
evaporator heater assembly to cowl side sheet metal.
(3) Install the retaining nuts on engine side.
(4) Connect vacuum lines on engine side.
(5) Install blower motor connector on engine side.
(6) Remove wiring connector from resistor block.
(7) Connect vacuum lines from extension on con­
trol unit and attach vacuum lines to defroster duct (Fig. 10).
(8) Connect temperature control cable to unit
through glove box. (9) Install floor air distribution duct.
(10) Install center distribution duct.
(11) Attach radio ground strap. (12) Remove right half of lower reinforcement by
removing screws attaching it to the instrument panel and the screw attaching it to the cowl side trim
panel. (13) Install ash receiver.
(14) Install structural brace through glove box
opening. Install screws and loosen nuts. (15) Install glove box by installing mounting
screws. (16) Install right cowl side trim panel, if so
equipped. (17) Position transfer case and/or gear shift levers.
(18) Remove plugs from heater hoses and unit. In­
stall condensate tube (Fig. 9). (19) Connect refrigerant and heater lines to unit
on engine side.
} (20) Connect the negative cable to the battery. (21) Fill the cooling system (refer to Group 7, Cool­
ing System). (22) Evacuate and charge the system.
(23) Check operation of all controls and perfor­
mance of the A/C system.
HEATING
AND AIR
CONDITIONING
24 - 37

'H"
VALVE

Fig.
13
Expansion
(H)
Valve
Assembly
ELECTRONIC
TEMPERATURE
CYCLING
SWITCH

REMOVAL
(1) Remove the electrical wires to the switch.
(2) Rotate switch counterclockwise to remove from
pressure switch port. (3) Remove and discard old O-ring.

INSTALLATION
(1) Install new O-ring. Refrigerant oil must be ap­
plied to the new O-ring.
(2) Rotate switch clockwise to install on suction
line pressure switch port. Tighten switch to 5.65 N#m (50 in. lbs.) torque.

CAUTION:
Power
tools
should
not be
used
for in­

stallation
of the switch. The
possibility
of stripping
the
switch
threads
occurs
above
5.88 N*m (52 in.
lbs.)
torque.
(3) Connect wires. (4) Verify operation.

EXPANSION
(H)
VALVE

REMOVAL
The system must be completely discharged before
opening any refrigerant lines. (1) Remove the bolt in center of plumbing sealing
plate (Fig. 13).
(2) Carefully pull refrigerant line assembly to­
wards front of vehicle. Take care NOT to scratch valve sealing surfaces with tube pilots.
(3) Remove the Torx Head screws (Fig. 13). Hold
valve, once cap screws are removed valve is com­
pletely disconnected.
(4) Carefully remove valve.

24
- 38
HEATING
AND AIR
CONDITIONING

INSTALLATION
(1) Remove and replace the aluminum N-gaskets
(1 on evaporator plate and 1 on plumbing plate). (2) Remove sealing cap from H-valve control head
side sealing surface and hold it against evaporator
sealing plate. DO NOT scratch sealing surface. In­
stall the Torx Drive screws and tighten to 11 N-m (100 in. lbs.) torque.
(3) Remove sealing cap from plumbing side sealing
surface and hold plumbing up to valve. Install the
bolt and tighten to 23 N*m (200 in. lbs.) torque.
(4) Connect wires to electronic temperature cycling
switch. (5) After expansion valve is installed and system
charged and leak checked, repeat performance check.

AIR CONDITIONER DISTRIBUTION AND SPOT
COOLER
DUCTS-CENTER

REMOVAL (1) Disconnect the negative cable from the battery.
(2) Open glove box past stops.
(3) Remove right upper air duct by removing
mounting screw and pulling duct out through glove
box opening (Fig. 9).
(4) Remove instrument panel center brace.
(5) Remove right kick pad.
(6) Remove right instrument panel pivot bolt.
(7) Remove instrument panel cluster.
(8) Disconnect shift indicator cable.
(9) Lower steering column.
(10) Remove steering column studs.
(11) Remove radio.
(12) Remove mounting screws and remove scoop
connecting heater unit to center distribution duct. (13) Remove mounting screws and remove center
distribution duct by pulling bottom of instrument
panel out and dropping duct out (Fig. 9).

INSTALLATION
(1) Position the center distribution duct through
the bottom of instrument panel (Fig. 9). Install mounting screws.
(2) Position the scoop connecting heater unit to
center distribution duct. Install mounting screws.
(3) Install radio.
(4) Install steering column studs.
(5) Place steering column into position.
(6) Connect shift indicator cable.
(7) Install instrument panel cluster.
(8) Install right instrument panel pivot bolt.
(9) Install right kick pad.
(10) Install instrument panel center brace.
(11) Position the duct in through glove box open­
ing (Fig. 9). Install mounting screw. (12) Close glove box.
(13) Connect the negative cable to the battery.
AIR CONDITIONER DISTRIBUTION AND SPOT

COOLER
DUCTS-RIGHT BI-LEVEL

REMOVAL (1) Disconnect the negative cable from the battery. (2) Open glove box past stops.
(3) Remove right upper air duct by removing
mounting screw and pulling duct out through glove
box opening (Fig. 9).

INSTALLATION
(1) Position the right upper air duct through glove
box opening (Fig. 9). Install mounting screw.
(2) Close glove box.
(3) Connect the negative cable to the battery.

AIR CONDITIONER DISTRIBUTION AND SPOT
COOLER
DUCTS-LEFT BI-LEVEL

REMOVAL
(1) Disconnect the negative cable from the battery.
(2) Remove instrument panel cluster.
(3) Disconnect shift indicator cable.
(4) Remove heater control.
(5) Remove mounting screws and cover that re­
tains instrument panel wiring and let wiring hang

free.

(6) Remove mounting screw and slide left air duct
out through instrument cluster opening (Fig. 9).

INSTALLATION
(1) Slide left air duct in through instrument clus­
ter opening (Fig. 9). Install mounting screw. (2) Position the cover that retains instrument
panel wiring. Install mounting screws.
(3) Install heater control.
(4) Connect shift indicator cable.
(5) Install instrument panel cluster.
(6) Connect the negative cable to the battery.

AIR OUTLET
ASSEMBLIES
RIGHT
SIDE
Both right side outlets are held in place with
spring loaded retaining clips.
REMOVAL (1) With outlet facing out and louver vanes open,
grasp adjusting vane with fingers.
(2) Pull smoothly and firmly to unseat clips and
complete removal toward rear of vehicle.

INSTALLATION
(1) Position outlet assembly in panel opening, f
making sure lettering stamped TOP is up (ribs on
housing match notches on instrument panel).
(2) Press housing assembly until both retaining
clips lock into place.

•
HEATING AND AIR CONDITIONING 24 - 39 LOU¥ER ASSEMBLIES
REMOVAL
(1) Remove faceplate.
(2) Set faceplate with trim surface down, insert a
small screwdriver tip into the outlet housing pivot

hole.

(3)
While forcing down louver assembly pivot pin,
pull louver assembly out of rear of faceplate (Fig. 9).
INSTALLATION

(1) Position louver assembly, bottom pivot first,
into the faceplate outlet housing. The bottom pivot
pin is a smaller diameter than the top pivot pin.
(2) While deflecting the upper louver assembly
pivot pin, carefully swing the assembly into housing, so the felt pads are not damaged. Ensure top and bot­
tom pivot pins are properly engaged. (3) Install faceplate.
TORQUE
SPECIFICATIONS

DESCRIPTION
fORQUE
DESCRIPTION

Compressor (SD-709) Cylinder Head Bolts 32 N-m (24 ft. lbs.)
Magnetic Clutch Hex Nut... 37 N-m (27 ft. lbs.)
Mounting Bolts 27 N-m (20 ft. lbs.)
Oil Filter Plug
10
N-m (7 ft. lbs.)
Service Valve-to-Compressor Fitting* ........ 47 N-m (35 ft. lbs.)
TORQUE

H-Valve Control Head Torx Drive Bolts
11
N-m
(100
in. lbs.)
H-Valve Plumbing Sealing Plate Bolt 23 N-m (200 in. lbs.)
Refrigerant Cans-to-Manifold Gauge Set Nuts 9.5 N-m (7
ft.
lbs.)
•Wet Torque - Lubricate the service valve
coupling
threads and
O-rings
with
compressor
oil.
J9324-100

COMPONENT AND SYSTEM INDEX

Name
Group-page

AUDIO
SYSTEMS
8F-1
SERVICE
PROCEDURES 8F-7
TEST PROCEDURES 8F-2
BATTERY/STARTER/GENERATOR SERVICE 8B-1 BATTERY SERVICE PROCEDURES 8B-1
GENERATOR SERVICE 8B-6
SPECIFICATIONS 8B-9
STARTER SERVICE PROCEDURES 8B-4
BODY COMPONENTS 23-1 CAB/BODY INTERIOR COMPONENTS
23-35

DOORS
23-21
EXTERIOR COMPONENTS 23-1
FIXED GLASS
23-29
PAINT
CODE CHART
23-54

REFINISHING PROCEDURES
23-54

BRAKES
5-1 BENDIX DISC BRAKE 5-37 BRAKE ADJUSTMENTS-BRAKE BLEEDING 5-7
BRAKE DIAGNOSIS 5-3

CHRYSLER
DISC BRAKE 5-27 DRUM BRAKES—ELEVEN INCH 5-46
DRUM BRAKES-TWELVE INCH 5-50
GENERAL INFORMATION 5-1 MASTER CYLINDER—COMBINATION VALVE-BRAKE
LINES 5-10
PARKING BRAKES 5-56
POWER BRAKE BOOSTER-BRAKE PEDAL 5-20 POWER BRAKE VACUUM PUMP-DIESEL ENGINE. . 5-22

REAR
WHEEL ANTILOCK
(RWAL)
BRAKES 5-59
SPECIFICATIONS 5-65
CHIME/BUZZER WARNING
SYSTEMS
8U-1
CLUTCH 6-1 CLUTCH DIAGNOSIS 6-2 CLUTCH SERVICE 6-11
COOLING SYSTEM 7-1
DIAGNOSIS 7-4
ENGINE ACCESSORY DRIVE BELTS 7-40
ENGINE BLOCK HEATERS 7-48

SERVICE
PROCEDURES 7-15 SPECIFICATIONS 7-49
ELECTRICAL 8A-1 BATTERY TEST PROCEDURES 8A-2
ENGINE STARTER MOTOR TEST PROCEDURES.... 8A-9
GENERAL INFORMATION 8A-1
GENERATOR TEST PROCEDURES ON VEHICLE . . . 8A-13
GROUP INDEX 8A-1
SPECIFICATIONS 8A-18
BATTERY/STARTING/CHARGING
SYSTEMS
DIAGNOSTICS 8A-1

EMISSION
CONTROL
SYSTEMS.
25-1 AIR INJECTION SYSTEM—5.9L HDC-GAS ENGINE . 25-15 COMPONENT REMOVAL/INSTALLATION 25-17 EVAPORATIVE EMISSION CONTROLS 25-6
EXHAUST EMISSION CONTROLS 25-10
GENERAL INFORMATION 25-1
ENGINES 9-1 3.9L ENGINE SERVICE PROCEDURES 9-17 5.2L ENGINE SERVICE PROCEDURES 9-47
5.9L (DIESEL) ENGINE SERVICE PROCEDURES . . . 9-107
Name
Group-page

5.9L ENGINE SERVICE PROCEDURES 9-77 ENGINE DIAGNOSIS 9-5
STANDARD SERVICE PROCEDURES 9-1
EXHAUST SYSTEM AND INTAKE MANIFOLD 11-1
EXHAUST SYSTEM DIAGNOSIS 11-3
GENERAL INFORMATION 11-1

SERVICE
PROCEDURES (DIESEL ENGINES) 11-17

SERVICE
PROCEDURES (GASOLINE ENGINES) 11-4
SPECIFICATIONS 11-27
FRAME AND BUMPERS 13-1 ATTACHED COMPONENTS 13-30
BUMPERS
13-1
FRAME 13-20
SNOW PLOW 13-3
FRONT SUSPENSION AND AXLE 2-1 FRONT SUSPENSION—2WD VEHICLES 2-7
FRONT SUSPENSION—4WD VEHICLES 2-14 FRONT WHEEL ALIGNMENT 2-3
GENERAL INFORMATION 2-1 MODEL 44 FRONT AXLE 2-17
MODEL 60 FRONT AXLE 2-49
TORQUE SPECIFICATIONS 2-75
FUEL SYSTEM 14-1 ACCELERATOR PEDAL AND THROTTLE CABLE . . . 14-25
DIESEL
FUEL INJECTION—COMPONENT DESCRIPTION/SYSTEM OPERATION 14-76

DIESEL
FUEL INJECTION-GENERAL DIAGNOSIS. . 14-88

DIESEL
FUEL INJECTION-SERVICE
PROCEDURES
14-106

FUEL DELIVERY SYSTEM-EXCEPT DIESEL 14-3
FUEL DELIVERY-DIESEL ENGINE 14-15 FUEL TANKS 14-20
GENERAL INFORMATION 14-1 MULTI-PORT FUEL INJECTION (MPI)-COMPONENT DESCRIPTION/SYSTEM OPERATION-EXCEPT
DIESEL
14-29
MULTI-PORT FUEL INJECTION
(MPlj-COMPONENT
REMOVAL/INSTALLATION-EXCEPT DIESEL .... 14-64
MULTI-PORT FUEL INJECTION (MPI)—GENERAL DIAGNOSIS-EXCEPT DIESEL 14-43

SERVICE
ADJUSTMENTS-DIESEL
14-122
SPECIFICATIONS
14-123

HEATING AND AIR CONDITIONING 24-1 CLIMATE CONTROL SYSTEM
24-29

COMPRESSOR
SERVICE
(SD-709)
24-21 DIAGNOSTIC PROCEDURES 24-3
GENERAL INFORMATION 24-1 REFRIGERANT SYSTEM SERVICE PROCEDURES . . 24-17
TORQUE SPECIFICATIONS
24-39

HORNS 8G-1
SERVICE
PROCEDURES 8G-3
TEST PROCEDURES 8G-1

IGNITION
SYSTEMS
8D-1 COMPONENT IDENTIFICATION/SYSTEM OPERATION. 8D-1
COMPONENT REMOVAL/INSTALLATION 8D-18 DIAGNOSTICS/SERVICE PROCEDURES 8D-7
IGNITION
SWITCH
8D-25

SPECIFICATIONS
8D-28

INSTRUMENT PANEL AND GAUGES 8E-1