Chrysler PT Cruiser Service & Repair Manual page 1931

PT
TEMPERATURE CONTROL CABLES (Continued)
(5) Install the instrument panel center stack bezel-
(Refer to 23 - BODY/INSTRUMENT PANEL/IN-
STRUMENT PANEL
INSTALLATION).
(6) Reconnect the battery negative cable.
ADJUSTMENTS
(1) Engage cable to actuator arm on temperature
door and attach to housing.
(2) Attach other end of cable to instrument panel
control.
(3) Turn the temperature knob completely counter-
clockwise.
(4) While holding the knob in the counterclockwise
position, pull on the gray casing of the temperature
cable. This will take up any free play in the cable
and index the temperature door to the temperature
knob.
(5) Then snap the cable hold down clip into posi-
tion.
(6) Remount control.
DISTRIBUTION
DESCRIPTION
DESCRIPTION - SYSTEM AIRFLOW
The system pulls outside (ambient) air through the
cowl opening at the base of the windshield. Then it
goes into the plenum chamber above the heater-A/C
housing. On air conditioned vehicles, the air passes
through the evaporator. Air flow can be directed
either through or around the heater core. This is
done by adjusting the blend-air door with the TEMP
control on the instrument panel. The air flow can
then be directed from the panel, floor and defrost
outlets in various combinations using the mode selec-
tor. There are 17 different mode selections possible.
Air flow velocity can be adjusted with the blower
speed selector switch on the instrument panel.
On A/C equipped vehicles the ambient air intake
can be controlled by opening and closing the recircu-
lating air door. When placed in RECIRC, air that is
inside vehicle is removed continuously and recircu-
lated through unit housing. Ambient air cannot be
controlled on vehicles without A/C. The system uses
outside air at all times.
The air conditioning compressor can be engaged by
turning the fan switch counterclockwise from the off
position. It can also be engaged by placing the mode
control in the mix to defrost positions. This will
remove heat and humidity from the air before it is
directed through or around the heater core.
CENTER BEZEL
HEATING & AIR COND. - LHD
DESCRIPTION - HEATER AND AIR
CONDITIONING
-
All vehicles are equipped with a common heater-
A/C housing assembly (Fig. 27). The system combines
air conditioning, heating, and ventilating capabilities
in a single unit housing mounted under the instru-
ment panel. On heater-only systems, the evaporator
coil is omitted from the housing and replaced with an
air restrictor plate.
Fig. 27 Common Blend-Air HVAC (Heating,
Ventilation, Air Conditioning) System - Typical
1 - TEMPERATURE BLEND/AIR DOOR
2 - EVAPORATOR CORE
3 - BLOWER
4 - PANEL DEFROST DOOR
5 - HEAT DEFROST DOOR
6 - HEATER CORE
7 - RECIRCULATING AIR DOOR
Outside air enters the vehicle through the cowl top
opening at the base of the windshield, and passes
through a plenum chamber to the heater-A/C system
blower housing. Air flow velocity can then be
adjusted with the blower motor speed selector switch
on the heater-A/C control panel. The air intake open-
ings must be kept free of snow, ice, leaves, and other
obstructions for the heater-A/C system to receive a
sufficient volume of outside air.
It is also important to keep the air intake openings
clear of debris because leaf particles and other debris
that are small enough to pass through the cowl ple-
num screen can accumulate within the heater-A/C
housing. The closed, warm, damp and dark environ-
ment created within the heater-A/C housing is ideal
for the growth of certain molds, mildews and other
fungi. Any accumulation of decaying plant matter
provides an additional food source for fungal spores,
which enter the housing with the fresh air. Excess
debris, as well as objectionable odors created by
decaying plant matter and growing fungi can be dis-
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