Jeep Wrangler TJ. Manual — part 588
(1) Disconnect the vacuum harness connector at
the back of the A/C-heater control (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 vacuum harness connector, one port at a
time, and pause after each connection (Fig. 13). 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 mode control switch. 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 Circuit charts (Fig. 14)
and (Fig. 15).
(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.
(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 fin-
gers 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 millimeter (0.125 inch) inside diameter
rubber hose.
Fig. 13 Vacuum Circuit Test
24 - 18
CONTROLS
TJ
A/C HEATER CONTROL (Continued)
Fig. 14 Vacuum Circuits - Heater Only
A - NOT USED
B - DEFROST ACTUATOR, FULL POSITION (YELLOW)
C - FLOOR ACTUATOR (BROWN)
D - DEFROST ACTUATOR, MID-POSITION (BLUE)
E - VACUUM SUPPLY, RESERVOIR (BLACK)
F - PANEL ACTUATOR (RED)
G - NOT USED
TJ
CONTROLS
24 - 19
A/C HEATER CONTROL (Continued)
Fig. 15 Vacuum Circuits - Heater-A/C
A - NOT USED
B - DEFROST ACTUATOR (YELLOW)
C - FLOOR ACTUATOR (BROWN)
D - DEFROST ACTUATOR, MID-POSITION (BLUE)
E - VACUUM SUPPLY, RESERVOIR (BLACK)
F - PANEL ACTUATOR (RED)
G - RECIRCULATION ACTUATOR (GREEN)
24 - 20
CONTROLS
TJ
A/C HEATER CONTROL (Continued)
REMOVAL
WARNING: On vehicles equipped with airbags, dis-
able the airbag system before attempting any steer-
ing wheel, steering column, or instrument panel
component diagnosis or service. Disconnect and
isolate the negative battery (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 air-
bag system. Failure to take the proper precautions
could result in accidental airbag deployment and
possible personal injury or death.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the center bezel from the instrument
panel (Refer to 23 - BODY/INSTRUMENT PANEL/
INSTRUMENT
PANEL
CENTER
BEZEL
-
REMOVAL).
(3) Remove the glove box from the instrument
panel (Refer to 23 - BODY/INSTRUMENT PANEL/
GLOVE BOX - REMOVAL).
(4) Reach through the glove box opening and dis-
connect the two halves of the A/C-heater control vac-
uum harness connector (Fig. 16).
(5) Remove the two screws that secure the A/C-
heater control to the instrument panel.
(6) Pull the A/C-heater control away from the
instrument panel to access the connections on the
back of the control.
(7) Disconnect the three wire harness connectors
from the back of the A/C-heater control (Fig. 17) and
remove the control from the vehicle.
INSTALLATION
(1) Connect the three wire harness connectors to
the back of the A/C-heater control.
(2) Position the A/C-heater control onto the instru-
ment panel and install the two retaining screws.
Tighten the screws to 2 N·m (17 in. lbs.).
(3) Reach through the glove box opening and con-
nect the A/C-heater vacuum harness connector.
(4) Install the glove box (Refer to 23 - BODY/IN-
STRUMENT PANEL/GLOVE BOX - INSTALLA-
TION).
(5) Install the center bezel (Refer to 23 - BODY/
INSTRUMENT
PANEL/INSTRUMENT
PANEL
CENTER BEZEL - INSTALLATION).
(6) Reconnect the negative battery cable.
A/C HIGH PRESSURE SWITCH
DESCRIPTION
The A/C high pressure switch controls A/C com-
pressor clutch engagement and disengagement when
equipped with the 4.0L engine. The A/C high pres-
sure switch is mounted on a fitting located on the
A/C discharge line near the A/C compressor. The A/C
high pressure switch turns off the A/C compressor if
Fig. 16 A/C-Heater Control - Typical
1 - BLOWER MOTOR CONTROL
2 - TEMPERATURE CONTROL
3 - MODE CONTROL
4 - VACUUM HARNESS CONNECTOR
5 - MOUNTING SCREW LOCATIONS
Fig. 17 A/C-Heater Control Connections - Typical
1 - A/C-HEATER CONTROL
2 - BLOWER MOTOR SWITCH
3 - BLOWER MOTOR SWITCH CONNECTOR
4 - TEMPERATURE/ILLUMINATION CONNECTOR
5 - MODE SWITCH CONNECTOR
6 - VACUUM HARNESS
7 - MODE SWITCH
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CONTROLS
24 - 21
A/C HEATER CONTROL (Continued)
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