2002 JEEP LIBERTY blend door replacement

HEATING & AIR CONDITIONING
TABLE OF CONTENTS
page page
HEATING & AIR CONDITIONING
DESCRIPTION
DESCRIPTION - HEATER AND AIR
CONDITIONER........................1
DESCRIPTION - COOLING SYSTEM
REQUIREMENTS.......................1
DESCRIPTION - REFRIGERANT SYSTEM
SERVICE PORT........................2
OPERATION
OPERATION - HEATER AND AIR
CONDITIONER........................2
OPERATION - REFRIGERANT SYSTEM
SERVICE PORT........................2
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - A/C
PERFORMANCE.......................2DIAGNOSIS AND TESTING - HEATER
PERFORMANCE.......................6
DIAGNOSIS AND TESTING - VACUUM
SYSTEM.............................6
STANDARD PROCEDURE - DIODE
REPLACEMENT.......................9
SPECIFICATIONS
A/C APPLICATION TABLE................9
SPECIFICATIONS.....................10
CONTROLS.............................11
DISTRIBUTION..........................29
PLUMBING.............................38
HEATING & AIR
CONDITIONING
DESCRIPTION
DESCRIPTION - HEATER AND AIR
CONDITIONER
All vehicles are equipped with a common HVAC
housing assembly (Fig. 1). The system combines air
conditioning, heating, and ventilating capabilities in
a single unit housing mounted under the instrument
panel. On heater-only systems, the evaporator coil is
omitted from the housing.
DESCRIPTION - COOLING SYSTEM
REQUIREMENTS
To maintain the performance level of the HVAC
system, the engine cooling system must be properly
maintained. The use of a bug screen is not recom-
mended. Any obstructions in front of the radiator or
condenser will reduce the performance of the air con-
ditioning and engine cooling systems.
The engine cooling system includes the heater core
and the heater hoses. Refer to Engine Cooling for
more information before the opening of, or attempt-
ing any service to the engine cooling system.
Fig. 1 Blend Door
1 - DEFROSTER DOOR
2- HEATER CORE
3- BLEND DOORS
4- BLOWER MOTOR HOUSING
5- EVAPORATOR (A/C ONLY)
6- LOWER HVAC CASE ASSEMBLY
KJHEATING & AIR CONDITIONING 24 - 1

(5) Connect the test set hose or probe to the open
end of the leaking circuit. The test set gauge should
return to the 27 kPa (8 in. Hg.) setting shortly after
each connection is made. If OK, replace the faulty
disconnected component. If not OK, go to Step 6.
(6)
To locate a leak in a vacuum line, leave one end
of the line plugged and connect the test set hose or
probe to the other end of the line. Run your fingers
slowly along the line while watching the test set gauge.
The vacuum reading will fluctuate when your fingers
contact the source of the leak. To repair the vacuum
line, cut out the leaking section of the line. Then, insert
the loose ends of the line into a suitable length of 3 mil-
limeter (0.125 inch) inside diameter rubber hose.
STANDARD PROCEDURE - DIODE
REPLACEMENT
(1) Disconnect the battery negative cable and iso-
late it.
(2) Locate the diode in the harness, and remove
the protective covering.
(3) Remove the diode from the harness, pay atten-
tion to the current flow direction (Fig. 5).
(4) Remove the insulation from the wires in the
harness. Only remove enough insulation to solder in
the new diode.
(5) Install the new diode in the harness, making
sure current flow is correct. If necessary refer to the
appropriate wiring diagram for current flow.
(6) Solder the connection together using rosin core
type solder only.Do not use acid core solder.
(7) Tape the diode to the harness using electrical
tape making, sure the diode is completely sealed
from the elements.
(8) Re-connect the battery negative cable, and test
affected systems.
SPECIFICATIONS
A/C APPLICATION TABLE
Item Description Notes
Vehicle KJ- Liberty
System R134a w/ fixed
orifice tube
Compressor Sanden PXF-18 SP-10 PAG oil
Freeze±up
ControlA/C low
pressure switchaccumulator
mounted
Low psi Control opens < 25 psi
- resets > 43
psi
High psi Control switch - opens
> 450-490 psi -
resets <
270-330 psidischarge line
Control Head manual type
Mode Door vacuum
Blend Door electric
Recirculation
Doorvacuum
Blower Motor hardwired to
control headresistor block
Cooling Fan viscous for
cooling, single
speed electric
for A/C
Clutch Electro-
mechanical
Control relay PCM
Draw 2 - 3.7 amps @
12V  0.5V @ 70É F
Gap 0.0169- 0.0319
DRB IIIT
Reads TPS, RPM, A/C
switch test
Actuators clutch and fan
relay
Fig. 5 DIODE IDENTIFICATION
1 - CURRENT FLOW
2 - BAND AROUND DIODE INDICATES CURRENT FLOW
3 - DIODE AS SHOWN IN THE DIAGRAMS
KJHEATING & AIR CONDITIONING 24 - 9
HEATING & AIR CONDITIONING (Continued)

DIFFERENTIAL - TRAC-LOK - CLEANING . . 3-109,
3-77
DIFFERENTIAL - TRAC-LOK -
DISASSEMBLY...................3-107,3-75
DIFFERENTIAL - TRAC-LOK -
INSPECTION....................3-109,3-77
DIFFERENTIAL CASE BEARINGS -
INSTALLATION...............3-110,3-44,3-79
DIFFERENTIAL CASE BEARINGS -
REMOVAL..................3-110,3-43,3-79
DIMENSIONS - SPECIFICATIONS, FRAME . . . 13-3
DIMENSIONS - SPECIFICATIONS,
OPENING..........................23-111
DIODE - INSTALLATION............8W-01-14
DIODE - REMOVAL................8W-01-14
DIODE REPLACEMENT - STANDARD
PROCEDURE.........................24-9
DISASSEMBLY - POWER DISTRIBUTION
CENTER DISASSEMBLY.............8W-97-7
DISASSEMBLY, 4C RETAINER/BULKHEAD . 21-122
DISASSEMBLY, DIAGNOSIS AND
TESTING...........................21-83
DISASSEMBLY, DIFFERENTIAL......3-105,3-41
DISASSEMBLY, DIFFERENTIAL -
TRAC-LOK......................3-107,3-75
DISASSEMBLY, DISASSEMBLY - POWER
DISTRIBUTION CENTER.............8W-97-7
DISASSEMBLY, DISC BRAKE CALIPERS....5-14
DISASSEMBLY, HVAC HOUSING.........24-34
DISASSEMBLY, INPUT CLUTCH
ASSEMBLY.........................21-135
DISASSEMBLY, INSTRUMENT CLUSTER....8J-9
DISASSEMBLY, LOW/REVERSE CLUTCH . . 21-145
DISASSEMBLY, MANUAL - NV1500........21-4
DISASSEMBLY, MANUAL - NV3550.......21-35
DISASSEMBLY, OIL PUMP...............9-65
DISASSEMBLY, OIL PUMP.............21-149
DISASSEMBLY, PLANETARY GEARTRAIN . 21-159
DISASSEMBLY, SINGLE CARDAN
UNIVERSAL JOINTS....................3-8
DISASSEMBLY, TRANSFER CASE -
NV231............................21-182
DISASSEMBLY, TRANSFER CASE -
NV242............................21-218
DISASSEMBLY, VALVE BODY...........21-173
DISASSEMBLY, WHEEL CYLINDERS.......5-28
DISC - INSTALLATION, CLUTCH...........6-6
DISC - REMOVAL, CLUTCH...............6-6
DISC BRAKE CALIPER ADAPTER -
INSTALLATION........................5-18
DISC BRAKE CALIPER ADAPTER -
REMOVAL...........................5-18
DISC BRAKE CALIPERS - ASSEMBLY......5-16
DISC BRAKE CALIPERS - CLEANING......5-16
DISC BRAKE CALIPERS - DESCRIPTION....5-13
DISC BRAKE CALIPERS - DISASSEMBLY . . . 5-14
DISC BRAKE CALIPERS - INSPECTION.....5-16
DISC BRAKE CALIPERS - INSTALLATION . . . 5-17
DISC BRAKE CALIPERS - OPERATION.....5-14
DISC BRAKE CALIPERS - REMOVAL.......5-14
DISC BRAKE ROTOR - DIAGNOSIS AND
TESTING............................5-18
DISC BRAKE ROTOR - STANDARD
PROCEDURE.........................5-19
DISCHARGE (ESD) SENSITIVE DEVICES -
STANDARD PROCEDURE,
ELECTROSTATIC...................8W-01-8
DISCHARGE LINE - INSTALLATION, A/C . . . 24-47
DISCHARGE LINE - REMOVAL, A/C.......24-46
DISPLAY TEST MODE - DESCRIPTION,
STATE ..............................25-2
DISTRIBUTION - DESCRIPTION, POWER . 8W-97-1
DISTRIBUTION - OPERATION, POWER . . 8W-97-1
DISTRIBUTION CENTER - DESCRIPTION,
POWER..........................8W-97-6
DISTRIBUTION CENTER - OPERATION,
POWER..........................8W-97-7
DISTRIBUTION CENTER - REMOVAL,
POWER..........................8W-97-7
DISTRIBUTION CENTER ASSEMBLY,
ASSEMBLY - POWER
..............8W-97-10
DISTRIBUTION CENTER DISASSEMBLY,
DISASSEMBLY - POWER
............8W-97-7
DISTRIBUTION SYSTEMS, SPECIAL
TOOLS - POWER
...................8W-97-2
DOO - INSTALLATION, FLOOR -
DEFROST
...........................24-37
DOOR - INSTALLATION
.........23-122,23-129DOOR - INSTALLATION, BLEND.........24-35
DOOR - INSTALLATION, PANEL..........24-36
DOOR - INSTALLATION, PASSENGER
AIRBAG............................8O-30
DOOR - INSTALLATION, RECIRC.........24-37
DOOR - REMOVAL.............23-122,23-129
DOOR - REMOVAL, BLEND.............24-35
DOOR - REMOVAL, DEFROST...........24-35
DOOR - REMOVAL, FLOOR - DEFROST....24-36
DOOR - REMOVAL, PASSENGER AIRBAG . . 8O-29
DOOR - REMOVAL, RECIRC............24-37
DOOR ACTUATOR - INSTALLATION,
BLEND.............................24-20
DOOR ACTUATOR - INSTALLATION,
FLOOR - DEFROST...................24-25
DOOR ACTUATOR - INSTALLATION,
PANEL.............................24-25
DOOR ACTUATOR - INSTALLATION,
RECIRCULATION.....................24-26
DOOR ACTUATOR - REMOVAL, BLEND....24-20
DOOR ACTUATOR - REMOVAL, FLOOR -
DEFROST...........................24-24
DOOR ACTUATOR - REMOVAL, PANEL....24-24
DOOR ACTUATOR - REMOVAL,
RECIRCULATION.....................24-26
DOOR AJAR INDICATOR - DESCRIPTION . . 8J-17
DOOR AJAR INDICATOR - OPERATION....8J-17
DOOR AJAR SWITCH - DESCRIPTION....8L-77
DOOR AJAR SWITCH - OPERATION........8L-77
DOOR CYLINDER LOCK SWITCH -
DESCRIPTION........................8Q-9
DOOR CYLINDER LOCK SWITCH -
DIAGNOSIS AND TESTING.............8Q-10
DOOR CYLINDER LOCK SWITCH -
INSTALLATION......................8Q-10
DOOR CYLINDER LOCK SWITCH -
OPERATION.........................8Q-10
DOOR CYLINDER LOCK SWITCH -
REMOVAL..........................8Q-10
DOOR GLASS - INSTALLATION . . 23-122,23-129,
23-172
DOOR GLASS - REMOVAL......23-122,23-129,
23-172
DOOR LOCK / UNLOCK SWITCH -
INSTALLATION.......................8N-5
DOOR LOCK / UNLOCK SWITCH -
REMOVAL...........................8N-4
DOOR LOCK MOTOR - DESCRIPTION......8N-5
DOOR LOCK MOTOR - DIAGNOSIS AND
TESTING............................8N-5
DOOR LOCK MOTOR - OPERATION.......8N-5
DOOR LOCK RELAY - DESCRIPTION......8N-6
DOOR LOCK RELAY - DIAGNOSIS AND
TESTING............................8N-6
DOOR LOCK RELAY - INSTALLATION......8N-7
DOOR LOCK RELAY - OPERATION........8N-6
DOOR LOCK RELAY - REMOVAL.........8N-6
DOOR LOCK/UNLOCK SWITCH -
DIAGNOSIS AND TESTING..............8N-4
DOOR LOWER WEATHERSTRIP -
INSTALLATION......................23-186
DOOR LOWER WEATHERSTRIP -
REMOVAL.........................23-186
DOOR OUTER BELT MOLDING -
INSTALLATION, FRONT...............23-186
DOOR OUTER BELT MOLDING -
INSTALLATION, REAR................23-186
DOOR OUTER BELT MOLDING -
REMOVAL, FRONT...................23-186
DOOR OUTER BELT MOLDING -
REMOVAL, REAR....................23-186
DOOR PRIMARY WEATHERSTRIP -
INSTALLATION......................23-185
DOOR PRIMARY WEATHERSTRIP -
REMOVAL.........................23-185
DOOR SCUFF PLATE - INSTALLATION,
REAR.............................23-160
DOOR SCUFF PLATE - REMOVAL, REAR . . 23-160
DOOR SILL SCUFF PLATE -
INSTALLATION......................23-157
DOOR SILL SCUFF PLATE - REMOVAL
. . . 23-157
DOOR/HOUSING - INSTALLATION, FUEL
FILL
..............................23-141
DOOR/HOUSING - REMOVAL, FUEL FILL
. 23-141
DOUBLE INVERTED FLARING -
STANDARD PROCEDURE
.................5-8
DRAIN AND FILL - STANDARD
PROCEDURE, FLUID
...........21-208,21-246DRAIN TUBE - INSTALLATION..........23-181
DRAIN TUBE - REMOVAL.............23-180
DRAINAGE AND WIND NOISE
DIAGNOSIS, DIAGNOSIS AND TESTING
- WATER ..........................23-176
DRAINING COOLING SYSTEM 3.7L
ENGINE - STANDARD PROCEDURE........7-12
DRAW TEST - STANDARD PROCEDURE,
IGNITION-OFF.......................8F-14
DRIVE - DIAGNOSIS AND TESTING,
VISCOUS FAN........................7-28
DRIVE BELT - DIAGNOSIS AND TESTING,
SERPENTINE.........................7-15
DRIVE MOTOR - INSTALLATION........23-182
DRIVE MOTOR - REMOVAL............23-182
DRIVER AIRBAG - DESCRIPTION........8O-17
DRIVER AIRBAG - INSTALLATION.......8O-20
DRIVER AIRBAG - OPERATION..........8O-18
DRIVER AIRBAG - REMOVAL...........8O-19
DRIVER SEAT HEATER SWITCH -
DESCRIPTION.......................8G-11
DRIVER SEAT HEATER SWITCH -
INSTALLATION......................8G-13
DRIVER SEAT HEATER SWITCH -
OPERATION.........................8G-12
DRIVER SEAT HEATER SWITCH -
REMOVAL..........................8G-13
DRIVER SIDE BEZELS - INSTALLATION,
INSTRUMENT PANEL.................23-154
DRIVER SIDE BEZELS - REMOVAL,
INSTRUMENT PANEL.................23-153
DROP - STANDARD PROCEDURE,
TESTING FOR A VOLTAGE...........8W-01-10
DRUM - DIAGNOSIS AND TESTING,
BRAKE..............................5-27
DRUM BRAKE - ADJUSTMENT, REAR......5-12
DRUM BRAKE - DESCRIPTION, REAR.....5-10
DRUM BRAKE - OPERATION, REAR.......5-11
DRUM BRAKE SHOES - INSTALLATION....5-11
DRUM BRAKE SHOES - REMOVAL........5-11
DRUM MACHINING - STANDARD
PROCEDURES, BRAKE.................5-27
DUCT - INSTALLATION, DEFROST/
DEMISTER..........................24-32
DUCT - INSTALLATION, FLOOR..........24-32
DUCT - INSTALLATION, FLOOR CONSOLE . 24-31
DUCT - REMOVAL, FLOOR.............24-32
DUCT - REMOVAL, FLOOR CONSOLE.....24-31
DUCT/DEMISTER ADAPTOR - REMOVAL,
DEFROST...........................24-32
EFFECTS OF INCORRECT FLUID LEVEL -
DIAGNOSIS AND TESTING............21-125
ELECTRIC - DESCRIPTION, RADIATOR
FAN ................................7-26
ELECTRIC - INSTALLATION, RADIATOR
FAN ................................7-27
ELECTRIC - INSTALLATION, WINDOW
REGULATOR.................23-126,23-134
ELECTRIC - OPERATION, RADIATOR FAN . . . 7-26
ELECTRIC - REMOVAL, RADIATOR FAN....7-26
ELECTRIC - REMOVAL, WINDOW
REGULATOR.................23-126,23-134
ELECTRICAL - DESCRIPTION............5-34
ELECTRICAL - OPERATION..............5-34
ELECTRICAL TESTER - STANDARD
PROCEDURE, USING MIDTRONICS.......8F-15
ELECTROSTATIC DISCHARGE (ESD)
SENSITIVE DEVICES - STANDARD
PROCEDURE......................8W-01-8
ELEMENT - DESCRIPTION, HEATED SEAT . 8G-13
ELEMENT - DIAGNOSIS AND TESTING,
HEATED SEAT .......................8G-13
ELEMENT - OPERATION, HEATED SEAT . . . 8G-13
EMISSION CONTROL INFORMATION
(VECI) LABEL - DESCRIPTION,
VEHICLE..........................Intro.-8
EMISSION CONTROL SYSTEM -
DESCRIPTION........................25-1
END - INSTALLATION, TIE ROD.........19-16
END - REMOVAL, TIE ROD.............19-16
END CAP - INSTALLATION, INSTRUMENT
PANEL
............................23-153
END CAP - REMOVAL, INSTRUMENT
PANEL
............................23-153
END REMOVAL TOOL, SPECIAL TOOLS -
OUTER TIE ROD
.....................19-15
ENGINE - 3.7L - DESCRIPTION
............9-3
ENGINE - DESCRIPTION, 3.7L
............7-21
8 INDEXKJ
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