Chrysler PT Cruiser Service & Repair Manual page 1919

PT
A/C HEATER CONTROL
DESCRIPTION
Both the heater-only and heater-A/C systems use a
combination of, electrical, cable, and vacuum con-
trols. These controls provide the vehicle operator
with a number of setting options to help control the
climate and comfort within the vehicle. Refer to the
owner's manual in the vehicle glove box for more
information on the features, use, and suggested oper-
ation of these controls.
The heater-only or heater-A/C control panel is
located to the right of the instrument cluster on the
instrument panel. The control panel contains rotary-
type knobs. There is a blower motor speed switch,
mode control switch, temperature control, and airflow
control.
The heater-only or heater-A/C control panel cannot
be repaired. If faulty or damaged, the entire unit
must be replaced. The control knobs and the illumi-
nation lamps are available for service replacement.
DIAGNOSIS AND TESTING - VACUUM
CONTROL SYSTEM
Use an adjustable vacuum test set (Special Tool
C-3707-B) and a suitable vacuum pump to test the
heater-A/C vacuum control system. With a finger
placed over the end of the vacuum test hose probe
CONDITION
NO FORCED AIR IN
HEAT POSITION
NO FORCED AIR IN
PANEL POSITION
NO FORCED AIR IN
DEFROST POSITION
HEATER-A/C VACUUM SYSTEM DIAGNOSIS
POSSIBLE CAUSES
1. Vacuum line pinched or
leaking.
2. Faulty heat defroster or
mode door.
3. Faulty selector switch.
4. Vacuum check valve.
1. Vacuum line pinched or
leaking.
2. Faulty mode door.
3. Faulty selector switch.
4. Vacuum check valve.
1. Vacuum line pinched or
leaking.
2. Faulty heat , defroster, or
mode door.
3. Faulty selector switch.
4. Vacuum check valve.
HEATING & AIR COND. - LHD
(Fig. 7), 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.
Fig. 7 Adjust Vacuum Test Bleed Valve
1 - VACUUM PUMP TOOL C-4289
2 - VACUUM TEST SET C-3707
3 - BLEED VALVE
4 - PROBE
CORRECTION
1. Locate and repair vacuum leak or pinched line.
2. Test actuators and door operation. Repair as
necassary.
3. Test selector switch and replace if necessary.
4. Test check valve and replace if necessary.
1. Locate and repair vacuum leak or pinched line.
2. Test actuator and door operation. Repair as
necessary.
3. Test selector switch and replace if necessary.
4. Test check valve and replace if necessary.
1. Locate and repair vacuum leak or pinched line.
2. Test actuators and door operation. Repair as
necessary.
3. Test selector switch and replace if necessary.
4. Test check valve and replace if necessary.
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