2002 JEEP LIBERTY instrument panel

INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Position the top cover and seat the clips fully.
(2) Install the a-pillar trim panels. (Refer to 23 -
BODY/INTERIOR/A-PILLAR TRIM AND GRAB
HANDLE - INSTALLATION)
INSTRUMENT PANEL END CAP
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Open the door.
(2) Using the finger indent, grasp and remove the
side cover. (Fig. 7)
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHERDIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Position the side panels and seat the clips fully.
INSTRUMENT PANEL DRIVER
SIDE BEZELS
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Using a trim stick C-4755 or equivalent, disen-
gage the bezels on either side of the steering column.
(Fig. 8)
Fig. 8 INSTRUMENT PANEL TRIM BEZELS
1 - INSTRUMENT PANEL
2 - DRIVERS SIDE TRIM BEZELS
3 - CENTER TRIM BEZEL
4 - SCREW
5 - PASSENGER SIDE TRIM BEZEL
KJINSTRUMENT PANEL 23 - 153
INSTRUMENT PANEL TOP COVER (Continued)

INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Position the appropriate divers side bezels on
either side of the steering column and seat the
attachment clips.
INSTRUMENT PANEL CENTER
BEZEL
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Remove the ashtray and remove the screw.
(2) Using a trim stick C-4755 or equivalent,
remove the center bezel from the instrument panel
assembly. (Fig. 8)
(3) Disconnect the electrical and vacuum connec-
tors.
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Connect the electrical and vacuum connectors.
(2) Position the center bezel and seat the retaining
clips starting with the lower clips first.
(3) Install the screw and install the ash tray.
INSTRUMENT PANEL
PASSENGER SIDE BEZEL
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Remove the two screws.
(2) Using a trim stick C-4755 or equivalent,
release the retaining clips and remove the passenger
side bezel. (Fig. 8)
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
23 - 154 INSTRUMENT PANELKJ
INSTRUMENT PANEL DRIVER SIDE BEZELS (Continued)

(1) Position the passenger side bezel and seat the
retaining clips.
(2) Install the two screws.
KNEE BLOCKER
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
CAUTION: Do not pry the knee blocker off at the
cover. Failure to follow these instructions may
result in damage to the knee blocker.
(1) At the label located on the lower instrument
panel cross member, place a trim stick C-4755 orequivalent, approximately 25 mm (1 in.) up directly
behind the lower edge of the knee blocker.
(2) Release the lower clips and pull off the knee
blocker.
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Position the knee blocker aligning attachment
clips.
(2) Pressing close to the attachment clips, fully
seat the lower and then the upper clips.
KJINSTRUMENT PANEL 23 - 155
INSTRUMENT PANEL PASSENGER SIDE BEZEL (Continued)

SEAT - FRONT
REMOVAL
WARNING: DISABLE THE SUPPLEMENTAL
RESTRAINTS SYSTEM BEFORE ATTEMPTING ANY
STEERING WHEEL, STEERING COLUMN, DRIVER
AIRBAG, PASSENGER AIRBAG, SEAT BELT TEN-
SIONER, SIDE CURTAIN AIRBAG, OR INSTRUMENT
PANEL COMPONENT DIAGNOSIS OR SERVICE.
DISCONNECT AND ISOLATE THE BATTERY NEGA-
TIVE (GROUND) CABLE, THEN WAIT TWO MINUTES
FOR THE SYSTEM CAPACITOR TO DISCHARGE
BEFORE PERFORMING FURTHER DIAGNOSIS OR
SERVICE. THIS IS THE ONLY SURE WAY TO DIS-
ABLE THE SUPPLEMENTAL RESTRAINTS SYSTEM.
FAILURE TO TAKE THE PROPER PRECAUTIONS
COULD RESULT IN ACCIDENTAL AIRBAG DEPLOY-
MENT AND POSSIBLE PERSONAL INJURY.
WARNING: DURING AND FOLLOWING ANY SEAT
BELT SERVICE, CAREFULLY INSPECT ALL SEAT
BELTS, BUCKLES, MOUNTING HARDWARE, AND
RETRACTORS FOR PROPER INSTALLATION,
OPERATION, OR DAMAGE. REPLACE ANY BELT
THAT IS CUT, FRAYED, OR TORN. STRAIGHTEN
ANY BELT THAT IS TWISTED. TIGHTEN ANY
LOOSE FASTENERS. REPLACE ANY BELT THAT
HAS A DAMAGED OR INOPERATIVE BUCKLE OR
RETRACTOR. REPLACE ANY BELT THAT HAS A
BENT OR DAMAGED LATCH PLATE OR ANCHOR
PLATE. NEVER ATTEMPT TO REPAIR A SEAT BELT
COMPONENT. ALWAYS REPLACE DAMAGED OR
FAULTY SEAT BELT COMPONENTS WITH THE COR-
RECT, NEW AND UNUSED REPLACEMENT PARTS
LISTED IN THE MOPAR PARTS CATALOG.
(1) Remove the seat belt anchor bolt. (Refer to 8 -
ELECTRICAL/RESTRAINTS/SEAT BELT &
RETRACTOR - REMOVAL)
(2) Slide seat back and remove the front bolts.
(Fig. 1)
(3) Slide seat to forward position and remove the
rear bolt/nut.
(4) Disconnect the electrical connectors and
remove the seat.
INSTALLATION
WARNING: DISABLE THE SUPPLEMENTAL
RESTRAINTS SYSTEM BEFORE ATTEMPTING ANY
STEERING WHEEL, STEERING COLUMN, DRIVER
AIRBAG, PASSENGER AIRBAG, SEAT BELT TEN-
SIONER, SIDE CURTAIN AIRBAG, OR INSTRUMENT
PANEL COMPONENT DIAGNOSIS OR SERVICE.
DISCONNECT AND ISOLATE THE BATTERY NEGA-TIVE (GROUND) CABLE, THEN WAIT TWO MINUTES
FOR THE SYSTEM CAPACITOR TO DISCHARGE
BEFORE PERFORMING FURTHER DIAGNOSIS OR
SERVICE. THIS IS THE ONLY SURE WAY TO DIS-
ABLE THE SUPPLEMENTAL RESTRAINTS SYSTEM.
FAILURE TO TAKE THE PROPER PRECAUTIONS
COULD RESULT IN ACCIDENTAL AIRBAG DEPLOY-
MENT AND POSSIBLE PERSONAL INJURY.
WARNING: DURING AND FOLLOWING ANY SEAT
BELT SERVICE, CAREFULLY INSPECT ALL SEAT
BELTS, BUCKLES, MOUNTING HARDWARE, AND
RETRACTORS FOR PROPER INSTALLATION,
OPERATION, OR DAMAGE. REPLACE ANY BELT
THAT IS CUT, FRAYED, OR TORN. STRAIGHTEN
ANY BELT THAT IS TWISTED. TIGHTEN ANY
LOOSE FASTENERS. REPLACE ANY BELT THAT
HAS A DAMAGED OR INOPERATIVE BUCKLE OR
RETRACTOR. REPLACE ANY BELT THAT HAS A
BENT OR DAMAGED LATCH PLATE OR ANCHOR
PLATE. NEVER ATTEMPT TO REPAIR A SEAT BELT
COMPONENT. ALWAYS REPLACE DAMAGED OR
FAULTY SEAT BELT COMPONENTS WITH THE COR-
RECT, NEW AND UNUSED REPLACEMENT PARTS
LISTED IN THE MOPAR PARTS CATALOG.
(1) Install the seats and connect the electrical con-
nectors.
(2) Slide the seat to the rearward position and
install the bolts.
(3) Tighten the outboard bolt to 43 N´m (32 ft. lbs.)
and then tighten the inboard bolt to 43 N´m (32 ft.
lbs.).
Fig. 1 FRONT SEATS
1 - FRONT SEATS
2 - BOLTS
3 - STUDS
4 - ELECTRICAL CONNECTORS
5 - NUTS
KJSEATS 23 - 165

WIND DEFLECTOR
REMOVAL
(1) Open sunroof glass panel to the full open posi-
tion.
(2) Remove screws attaching wind deflector straps
to front crossmember (Fig. 6).(3) Rotate wind deflector back about 110É and slide
backwards to disengage from the spring hook.
INSTALLATION
(1) Place wind deflector in position 110É to roof.
(2) Push arms down and forward to engage spring
hooks.
(3) Rotate wind deflector forward into correct posi-
tion. Depress wind deflector down onto front cross-
member to check spring function.
(4) Install fasteners attaching wind deflector
straps to front crossmember.
(5) Test sunroof operation.
OPENING TRIM LACE
REMOVAL
(1) Remove lace by starting at the joint center of
the opening on driver's side.
(2) Pull one end of the lace away from the head-
liner until the entire lace is removed.
INSTALLATION
(1) Place end of trim lace into position starting at
center of the opening on driver's side.
(2) Push lace into position.
(3) Ensure that the corner radii is fully engage.
(4) Once trim lace is attached to sunroof module
begin tucking the headline under the lip on the trim
lace working all the way around the opening.
DRAIN TUBE
REMOVAL
FRONT DRAIN TUBES
(1) Move glass panel to the fully closed position.
(2) Remove sunroof opening trim lace.
(3) Remove the headliner. (Refer to 23 - BODY/IN-
TERIOR/HEADLINER - REMOVAL)
(4) Disconnect the drain hose from the sunroof
housing (Fig. 7).
(5) Drain any liquid from hose connection, if nec-
essary.
(6) Remove the instrument panel top panel. (Refer
to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL TOP COVER - REMOVAL)
(7) Disconnect the grommet, attachment clips and
remove the drain tube.
REAR DRAIN TUBES
(1) Move glass panel to the fully closed position.
(2) Remove sunroof opening trim lace.
(3) Remove headliner.
Fig. 5 TROUGH GUIDE REMOVAL
1 - TROUGH GUIDE
2 - NOTCH
3 - SLIDER
Fig. 6 SUNSHADE
1 - WIND DEFLECTOR
2 - SCREW
3 - SPRING
23 - 180 SUNROOFKJ
GUIDE ASSEMBLY (Continued)

(4) Disconnect the drain hose from the sunroof
housing (Fig. 8).
(5) Drain any liquid from hose connection, if nec-
essary.
(6) Disconnect the grommet, attachment clips and
remove the drain tube.
INSTALLATION
FRONT DRAIN TUBES
(1) Connect the drain hose to the sunroof housing
and test drainage.
(2) Connect the body grommet and attachment
clips.
(3) Install the instrument panel top panel. (Refer
to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL TOP COVER - INSTALLATION)
(4) Install the headliner. (Refer to 23 - BODY/IN-
TERIOR/HEADLINER - INSTALLATION)
(5) Install sunroof opening trim lace. (Refer to 23 -
BODY/SUNROOF/OPENING TRIM LACE - INSTAL-
LATION)
REAR DRAIN TUBES
(1) Connect the drain hose to the sunroof housing
and test drainage.
(2) Connect the body grommet and attachment
clips.
(3) Install the headliner.(4) Install sunroof opening trim lace.
MODULE ASSEMBLY
REMOVAL
(1) Move glass panel to the fully closed position.
(2) Disconnect and isolate the negative battery
cable.
(3) Remove sunroof opening trim lace.
(4) Remove headliner. (Refer to 23 - BODY/INTE-
RIOR/HEADLINER - REMOVAL)
(5) Disconnect wire harness push in fasteners and
electrical connector. (Fig. 9)
(6) Disconnect the drain tubes from sunroof hous-
ing.
(7) Loosen fasteners attaching sunroof module
assembly.
(8) With the aid of a helper, remove fasteners
attaching sunroof module assembly to roof panel
(Fig. 10).
INSTALLATION
(1) With the Glass panel in the fully closed posi-
tion.
(2) Raise rear end of sunroof module assembly and
guide into position and start fasteners.
(3) Tighten the fasteners to 9 N´m (80 in. lbs.).
(4) Connect the drain tubes.
Fig. 7 FRONT DRAIN TUBE
1 - TUBE
2 - CLIPS
3 - GROMMET
Fig. 8 REAR DRAIN TUBE
1 - GROMMET
2 - TUBE
3 - CLIPS
KJSUNROOF 23 - 181
DRAIN TUBE (Continued)

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

Use an adjustable vacuum test set (Special Tool
C-3707-B) and a suitable vacuum pump to test the
HVAC vacuum control system. With a finger placed
over the end of the vacuum test hose probe (Fig. 3),
adjust the bleed valve on the test set gauge to obtain
a vacuum of exactly 27 kPa (8 in. Hg.). Release and
block the end of the probe several times to verify that
the vacuum reading returns to the exact 27 kPa (8
in. Hg.) setting. Otherwise, a false reading will be
obtained during testing.
VACUUM CHECK VALVE
(1) Remove the vacuum check valve. The valve is
located in the vacuum supply tube (black) at the
HVAC system vacuum tee.
(2) Connect the test set vacuum supply hose to the
A/C Heater Control side of the valve. When con-
nected to this side of the check valve, no vacuum
should pass and the test set gauge should return to
the 27 kPa (8 in. Hg.) setting. If OK, go to Step 3. If
not OK, replace the faulty valve.
(3) Connect the test set vacuum supply hose to the
engine vacuum side of the valve. When connected to
this side of the check valve, vacuum should flow
through the valve without restriction. If not OK,
replace the faulty valve.
A/C HEATER CONTROLS
(1) Connect the test set vacuum probe to the
HVAC vacuum supply (black) tube at the tee in the
engine compartment. Position the test set gauge so
that it can be viewed from the passenger compart-
ment.(2) Place the A/C Heater Mode Control switch
knob in each mode position, one position at a time,
and pause after each selection. The test set gauge
should return to the 27 kPa (8 in. Hg.) setting
shortly after each selection is made. If not OK, a
component or vacuum line in the vacuum circuit of
the selected mode has a leak. See the procedure in
Locating Vacuum Leaks.
CAUTION: Do not use lubricant on the switch ports
or in the holes in the plug, as lubricant will ruin the
vacuum valve in the switch. A drop of clean water
in the connector plug holes will help the connector
slide onto the switch ports.
LOCATING VACUUM LEAKS
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN AN ACCIDENTAL
AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Disconnect the vacuum harness connector from
the back of the HVAC control head(Refer to 24 -
HEATING & AIR CONDITIONING/CONTROLS/A/C
HEATER CONTROL - REMOVAL).
(2) Connect the test set vacuum hose probe to each
port in the HVAC housing half of the vacuum har-
ness connector, one port at a time, and pause after
each connection. The test set gauge should return to
the 27 kPa (8 in. Hg.) setting shortly after each con-
nection is made. If OK, replace the faulty A/C Heater
Control. If not OK, go to Step 3.
(3) Determine the vacuum line color of the vacuum
circuit that is leaking. To determine the vacuum line
colors, refer to the Vacuum Circuits chart (Fig. 4).
(4) Disconnect and plug the vacuum line from the
component (fitting, actuator, valve, switch, or reser-
voir) on the other end of the leaking circuit. Instru-
ment panel disassembly or removal may be necessary
to gain access to some components. See the appropri-
ate service procedures.
Fig. 3 ADJUST VACUUM TEST BLEED VALVE
1 - VACUUM PUMP TOOL C-4289
2 - VACUUM TEST SET C-3707
3 - BLEED VALVE
4 - PROBE
KJHEATING & AIR CONDITIONING 24 - 7
HEATING & AIR CONDITIONING (Continued)