each outboard end of the instrument panel top cover,
near the belt line at the A-pillars.
• Panel Outlets - There are four panel outlets in
the instrument panel, one located near each outboard
end of the instrument panel facing the rear of the
vehicle and two located near the top of the instru-
ment panel center bezel.
• Front Floor Outlets - There are four front
floor outlets, two located above each side of the floor
panel center tunnel near the dash panel.
• Rear Floor Outlets - There are two rear floor
outlets, one located on each side of the floor panel
center tunnel near the front of each rear seat foot
well.
A heater booster is used to aid in warming the
engine coolant on vehicles equipped with the 2.2 liter
diesel engine. The heater booster system is switched
on while the vehicle is being driven to help the
engine
reach
its
normal
operating
temperature
quickly and to help aid in heating up the air within
the passenger compartment quickly when requested
by the operator (Refer to 24 - HEATING & AIR CON-
DITIONING/CABIN HEATER - DESCRIPTION).
OPERATION
The heating-A/C system pulls outside (ambient) air
through the cowl opening at the base of the wind-
shield, then into the plenum chamber above the heat-
ing, ventilation and air conditioning (HVAC) housing.
On models equipped with A/C, the air passes through
the A/C evaporator. Air flow can be directed either
through or around the heater core. This is done by
adjusting the blend-air door with the temperature
control located on the A/C-heater control in the
instrument panel. The air flow can then be directed
from the panel, floor and defrost outlets in various
combinations using the mode control. There are 17
different mode selections possible. Air flow velocity
can be adjusted with the blower speed control.
On models equipped with A/C, the ambient air
intake can be controlled by opening and closing the
recirculating air door. When placed in the Recircula-
tion position, air that is inside the vehicle is contin-
uously recirculated through the HVAC housing.
Ambient air cannot be controlled on vehicles without
A/C. The system uses outside air at all times.
The A/C compressor can be engaged by turning the
blower motor control 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.
The defroster outlet receives airflow from the
HVAC housing through the molded plastic defroster
duct, which is snapped onto the HVAC housing
defroster outlet and secured by two tabs to mounting
slots in the instrument panel top cover. The airflow
from the defroster outlet is directed by fixed vanes in
the defroster outlet grille and cannot be adjusted.
The defroster outlet grille is integral to the instru-
ment panel top cover.
The side window demister outlets receive airflow
from the HVAC housing through the air outlet distri-
bution duct, two molded plastic demister hoses and,
on the right side only, an intermediate duct. The air
outlet distribution duct is secured to the instrument
panel with screws and receives airflow through the
panel outlet of the HVAC housing. The airflow from
the side window demister outlets is directed by fixed
vanes in the demister outlet grilles and cannot be
adjusted. The side window demister outlet grilles are
integral to the instrument panel top cover. The
demisters direct air from the HVAC housing through
the outlets located on the top corners of the instru-
ment panel. The demisters operate when the mode
control is anywhere between floor and defrost set-
tings. Some air may be noticeable from the demister
outlets when the mode control is in the bi-level to
floor positions.
The panel outlets also receive airflow from the
HVAC housing through the air outlet distribution
duct. Molded plastic panel outlet ducts and, on the
left side only, an intermediate elbow direct airflow
from the distribution duct to the outboard panel out-
lets, while a center air outlet duct directs airflow
from the distribution duct to the two center panel
outlets. The airflow from each of the panel outlets is
adjustable. A knob in the center of each panel outlet
grille is used in a joystick fashion to adjust a center
diffuser that changes the airflow direction, and a
knob on the outer edge of each panel outlet grille
opens or closes a shutter to turn airflow on or off
through that outlet.
The front and rear floor outlets receive airflow
from the HVAC housing through the floor distribu-
tion duct. The front floor outlets are integral to the
molded plastic floor distribution duct, which is
secured to the bottom of the HVAC housing. A
molded plastic rear seat duct elbow is fitted to the
bottom of the floor distribution duct and directs air-
flow through a molded plastic duct beneath the car-
pet on the right side of the floor panel center tunnel
to the right rear floor outlet. The right floor duct also
features a crossover fitting that joins the right floor
duct to the left floor duct over the top of the floor
panel center tunnel to direct airflow to the left rear
floor outlet. None of the floor outlets can be adjusted.
24 - 2
HEATING & AIR CONDITIONING
PT
HEATING & AIR CONDITIONING (Continued)