940 L4-2.3L SOHC VIN 88 B230F (1992)
Thermostatic Air Cleaner: Description and Operation
Fig. 60 THERMOSTATIC AIR CONTROL SYSTEM
PURPOSE
The thermostatic air control system improves driveability and emissions compliance during warm-up and while driving in very cold weather.
CONSTRUCTION
The thermostatic air cleaner housing consists of a thermostatically operated air damper and hot and cold air inlet ducts.
OPERATION
The thermostat senses the air temperature and positions the damper for the correct hot/cold air mixture. The hot air gets drawn from near the
exhaust manifold, while the cold air gets taken from the regular outside inlet duct. This results in a constant intake air temperature, regardless of
the outside temperature. Fig. 60.
TAC thermostat specifications:
Hot air only to 5°C (41°F)
Cold air only from 15°C (59°F)
