Thermostatic Air Cleaner: Description and Operation

Fig. 60 THERMOSTATIC AIR CONTROL SYSTEM:

The thermostatic air cleaner housing consists of a thermostatically operated air damper and hot and cold air inlet ducts. 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.
The thermostatic air control system improves driveability during warm-up, and while driving in very cold weather.

Thermostatic Air Control thermostat:

Hot air only to 5°C (41°F)
Cold air only from 15°C (59°F)