Fuel Emission and Exhaust System
D:07:01
AIR
INLET
SYSTEM
DESCRIPTION AND OPERATION
The temperature of the incoming air to the engine
is controlled to improve driveability and reduce
exhaust emissions. The temperature of the air is
controlled by the air valve housing (3)* which is
connected to the cold air inlet
(2)
and the hot air
stove (4).
A wax thermostat inside the air valve housing
determines the position of a flap controlling the
incoming air. The flap is fully open to exhaust
manifold heated air at temperatures below 15°C
(59°F).
As ambient temperature increases, the flap
allows a mixture of hot and cold air to enter the
engine until
25°C (77°F)
is reached. At this time,
the flap is fully closed to hot air and fully open to
the outside cold air inlet. Fig. 43
1 Air cleaner assy
*-*.
2 Cold air inlet
\D
3
Hot/cold
air valve housing
4 Hot air stove
5 Exhaust manifold
©
Fig.
43
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