Chrysler PT Cruiser Service & Repair Manual page 1932

24 - 26 HEATING & AIR COND. - LHD
DISTRIBUTION (Continued)
charged into the passenger compartment during
heater-A/C system operation.
The heater and optional air conditioner are blend-
air type systems. In a blend-air system, a blend-air
door controls the amount of unconditioned air (or
cooled air from the evaporator on models with air
conditioning) that is allowed to flow through, or
around, the heater core. A temperature control knob
on the heater-A/C control panel determines the dis-
charge air temperature by moving a cable, which
operates the blend-air door. This allows an almost
immediate manual control of the output air tempera-
ture of the system.
The mode control knob on the heater-only or heat-
er-A/C control panel is used to direct the conditioned
air to the selected system outlets. The mode control
switch uses a cable to control the mode door, while
the recirculation air door is operated by a vacuum
actuator motor.
On air conditioned vehicles, the outside air intake
can be shut off by selecting the recirculation mode
(Recirc) with the mode control knob. This will oper-
ate a vacuum actuated recirculating air door that
closes off the outside fresh air intake and recirculates
the air that is already inside the vehicle.
The optional air conditioner for all models is
designed for the use of non-CFC, R-134a refrigerant.
The air conditioning system has an evaporator to cool
and dehumidify the incoming air prior to blending it
with the heated air. This air conditioning system
uses an evaporator probe to maintain minimum
evaporator temperature and prevent evaporator
freezing, and cycles the compressor clutch.
AIR FILTER - EXPORT
DESCRIPTION
All Export model PT-44's are now equipped with an
Air Conditioning air filter. The filter is mounted
under the hood in the air intake. The filter should be
checked and replaced at least once every 24,000 km
(15,000 miles) and checked if system performance
seems lower than expected.
REMOVAL
(1) Open the hood.
(2) Remove the passenger side cowl grille screen-
(Refer to 23 - BODY/EXTERIOR/COWL GRILLE
SCREEN - REMOVAL).
(3) Loosen the bolts fastening windshield washer
reservoir to the body. Removal of the reservoir is not
necessary just loosen it enough to allow access to the
filter element.
(4) Remove the filter element by lifting the filter
element up and out of it housing.
INSTALLATION
(1) Install filter element by inserting the element
down directly into the element housing. The filter is
held in place by friction between the filter element
and the housing so no fasteners are used..
(2) Position windshield
tighten bolts to 8 N·m ( 70 in. lbs.).
(3) Install passenger side cowl grill screen(Refer to
23 - BODY/EXTERIOR/COWL GRILLE SCREEN -
INSTALLATION).
(4) Close hood.
AIR FLOW DISTRIBUTION
DESCRIPTION
Fig. 28 HVAC Outlets
1 - DEFROST
2 - DE-MIST
3 - PANEL OUTLETS
4 - FLOOR
5 - DE-MIST
Based upon the system mode selected, conditioned
air can exit the standard heater-only or optional
heater-A/C unit housing through one or a combina-
tion of the three main housing outlets: defrost, panel
or floor. The defrost outlet is located on the top of the
housing, the panel outlet is located on the face of the
housing and the floor outlet is located on the bottom
of the housing. Once the conditioned air exits the
unit housing, it is further directed through molded
plastic ducts to the various outlets in the vehicle
interior (Fig. 28). These outlets and their locations
are as follows:
• Defroster Outlet - A single large defroster out-
let is located in the center of the instrument panel
top cover, near the base of the windshield.
• Side Window Demister Outlets - There are
two side window demister outlets, one is located at
PT
washer reservoir and