Jeep Liberty KJ. Manual — part 1407
CONTROL-A/C HEATER
DESCRIPTION
The A/C-heater control for the manual temperature
control (MTC) single zone heating-A/C system allows
one temperature setting for the entire vehicle. All con-
trols are identified by ISO graphic symbols.
The heating-A/C system uses a combination of, elec-
trical and vacuum controls. These controls provide the
vehicle operator with a number of setting options to
help control the climate and comfort within the vehicle.
The A/C-heater control is located in the instrument
panel and contains:
•
a push button A/C on/off control (1). The snow-
flake button contains an LED that illuminates
when the A/C system is in operation.
•
a push button rear window defogger on/off con-
trol (2). The defogger button contains an LED
that illuminates when the rear window defogger
system is in operation.
•
a rotary control for temperature control of the dis-
charged air (3)
•
a rotary control for turning the heating-A/C system on and off and for recirculation and mode control of the
discharged air (4).
•
a rotary control for fan speed selection (5).
The A/C-heater control cannot be repaired and, if faulty or damaged, it must be replaced. The control knobs and
illumination lamps are available for service replacement.
DIAGNOSIS AND TESTING
VACUUM CONTROL SYSTEM
Use an adjustable Vacuum Test Set (Special Tool
C-3707-B or equivalent) (2) and a suitable vacuum
pump (1) to test the heater-A/C vacuum control sys-
tem.
Place a finger over the end of the Vacuum Test Probe
(4) and adjust the bleed valve (3) on the Vacuum Test
Gauge to obtain a vacuum of exactly -27 kPa (-8 in.
Hg.). Release and block the end of the Vacuum Test
Probe several times to verify that the vacuum reading
returns to the exact -27 kPa (-8 in. Hg.) setting. Oth-
erwise, 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 line (black) at the HVAC system
vacuum tee.
2. Connect the Vacuum Test Probe from the Vacuum Test Set to the heater side of the vacuum check valve. When
connected to this side of the check valve, no vacuum should pass and the Vacuum Test Gauge should return to
the -27 kPa (-8 in. Hg.) setting. If OK, go to step Step 3. If not OK, replace the faulty vacuum check valve.
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3. Connect the Vacuum Test Probe from the Vacuum Test Set to the engine side of the vacuum check valve. When
connected to this side of the check valve, vacuum should flow through the valve without restriction. If not OK,
replace the faulty vacuum check valve.
A/C HEATER CONTROLS
NOTE: The operation of the recirculation-air door can be viewed by removing the blower motor and looking
up into the HVAC housing (Refer to 24 - HEATING & AIR CONDITIONING/DISTRIBUTION/MOTOR-BLOWER -
REMOVAL).
1. Connect the Vacuum Test Probe to the vehicle vacuum supply (black) line. Position the Vacuum Test Gauge so
it can be viewed from the passenger compartment.
2. Place the A/C-heater mode control in each mode position, one position at a time, and pause after each selection.
The Vacuum Test Gauge should return to the calibrated setting of -27 kPa (-8 in. Hg.) setting shortly after each
selection is made. If the Vacuum Test Gauge cannot achieve the calibrated setting, the vacuum circuit or a com-
ponent has a vacuum leak. See the procedure in Locating Vacuum Leaks.
LOCATING VACUUM LEAKS
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering
wheel, steering column, or instrument panel component diagnosis or service. 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 an accidental airbag deployment and possible personal injury or
death.
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CAUTION: Do not use lubricant on the switch ports or in the holes of the connector, as lubricant will ruin
the vacuum valve in the switch. A drop of clean water in the connector holes will help the connector slide
onto the switch ports.
1. Disconnect the vacuum harness connector from the back of the A/C-heater control (Refer to 24 - HEATING &
AIR CONDITIONING/CONTROLS/CONTROL-A/C HEATER - REMOVAL).
2. Connect the Vacuum Test Probe to each port in the HVAC housing half of the vacuum harness 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 connection 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.
4. Disconnect and plug the vacuum line from the component (fitting, actuator, valve, switch, or reservoir) on the
other end of the leaking circuit. Instrument panel disassembly or removal may be necessary to gain access to
some components. See the appropriate 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 com-
ponent. 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 millimeter (0.125
inch) inside diameter rubber hose.
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REMOVAL
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering
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 airbag system. Failure to
take the proper precautions could result in accidental airbag deployment and possible personal injury or
death.
1. Disconnect and isolate the negative battery cable.
2. Remove the center bezel from the instrument panel
(Refer to 23 - BODY/INSTRUMENT PANEL/IN-
STRUMENT
PANEL
CENTER
BEZEL
-
REMOVAL).
3. Remove the four screws that secure the A/C-heater
control (1) to the instrument panel at the mounting
screw locations shown (7).
4. Remove the A/C-heater control from the instrument
panel to gain access to the wire harness connec-
tions (3 and 6) and the vacuum harness connector
(5) at the rear of the A/C-heater control.
5. Disconnect the vacuum harness and wire harness
connectors from the A/C-heater control and remove
the control from the vehicle.
6. If required, remove the illumination lamps (2 and 4)
from the A/C-heater control.
INSTALLATION
1. If removed, install the illumination lamps (2 and 4)
into the rear of the A/C-heater control (1).
2. Connect the wire harness and vacuum connectors
to the connections (3, 5 and 6) at the rear of the
A/C-heater control.
3. Position the A/C-heater control into the instrument
panel and install the four retaining screws at the
locations shown (7). Tighten the screws to 2 N·m
(17 in. lbs.).
4. Install the instrument panel center bezel (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL CENTER BEZEL - INSTALLATION).
5. Reconnect the negative battery cable.
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