Page 1769 of 2490

Air Distribution and Filtering - Air Distri
bution and Filtering
Description an
d Operation
Air Distribution
Ou
tside air enters the plen
um via four inlets in the lower windshield panel.
If the air conditioning system is operating in FRESH mode (not recirculation mode), then air is drawn through the four
plenum apertures (and particle filters where fitted) and into the air conditioni ng unit via the blower interconnecting ducts in
the LH and RH blower assemblies. Air is c ooled and dehumidified as it passes through the evaporator and is then 'reheated'
to the required temperature as it passes through the heater matrix.
In RECIRCULATION mode, the air in the pass enger compartment is drawn into the air conditioning unit via the recirculation
air inlets on the blower assemblies.
In FRESH mode, air flows from the cabin into the trunk through a gap between the backlight and the parcel shelf. The air is
exhausted from the vehicle through extraction vent assemblies (incorporating one way flaps) whose outlets are above the
rear mufflers.
Air Flow Path
Air Distribution Modes
Bi
-level mode
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Fac e
mode
Defog mode
Foot mode.(with automatic air bleed to the windshield)
Foot / defog mode
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Air
Particle Filter
The air particle filter system (where fitted) is located in the plenum below the windshield .
• NOTE: Refer to 'Filter Compensation', Section 412-04.
The filter elements are retained by adhesive strip which is atta ched to the filter moulding; the filter is fitted with the light,
flocked surface towards the engine.
Loca
tion of Air Distribution Ducts
LHD s
hown
Page 1772 of 2490
Page 1773 of 2490

Ai
r Distribution Box (ADB)
The upper air distribution box ADB, is fixed to the defog duct and instrument panel assembly, and seals by contact pressure
to the outlet (top) of the air conditioning unit. The ADB inco rporates two servo motor operated flaps which regulate airflow
to:
Windshield and door drop
glass
Instrument panel
- center, left
hand and right hand vents
The center vent duct incorporat es a baffle plate which balances the volume of air flow between the center and right and left
hand vents.
5R
ear intermediate footwell duct - RH
6R
ear footwell duct - RH
7R
ear face duct - RH
8R
ear face duct - LH
9R
ear footwell duct - LH
10R
ear intermediate footwell duct - LH
11D
river footwell duct - LHD
12Fac
e level duct -
LH
It
em
De
scription
1Ai
r outlet - side vent
2Servo motor -
instrume
nt panel center vent
3Servo motor -
defog vent
4Ai
r outlet - instrume
nt panel center vent
5Ai
r outlet - defog vent
It
em
De
scription
1Fac
e level duct - RH
2Passenger footwel
l duct - LHD
3Fac
e level duct - center
4Rear
face primary duct
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I n
strument Pane
l Air Outlets
Ite
m
De
scr
iption
1Ai
r i
nlet - from RH blower (LH opposite, not shown)
2Ai
r outl
et - instrument
panel center vents
3Air ou
tlet - defog
4Ai
r outl
et - instru
ment panel LH and RH side vents
5Air outl
et - footwell
6Flap -
cool air
bypass
7Evaporator
8Matrix -
heater
Internal Components and Ai
r Fl
ow
Page 1775 of 2490
Ai
r temperature from the center, right and left
hand vents is slightly cooler than the foot outlets; however this temperature
cannot be varied independently.
The instrument panel side vents, not shown, feature similar controls.
1Ai
r flow control
2Air di
rection control
It
em
De
scription
Page 1776 of 2490
Air Distribution and Filtering - Air Distribution and Filtering
Diagnosis and Testing
Refer to section 412-00.