thermostatic air cleaner

(TAC) An air cleaner which also controls the temperature of the air entering the engine. A temperature control is necessary to optimize the air/fuel ratio with regard to minimum exhaust emissions; typically, the TAC regulates air intake temperature at about 27-46°C by means of a control damper that mixes pre-heated air from an inlet at the exhaust manifold with air from a cold air inlet; designs for actuating the damper range from simple thermostatic action to vacuum-motor and stepper-motor control

Dictionary of automotive terms. 2015.

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