Fan clutch ndi makina oziziritsa a injini ya thermostatic omwe amatha kuzizira pamatenthedwe otsika pomwe kuzizirira sikufunikira, kulola injiniyo kutentha mwachangu, ndikuchepetsa katundu wosafunika pa injini. Pamene kutentha kumawonjezeka, clutch imagwira ntchito kotero kuti fani imayendetsedwa ndi mphamvu ya injini ndikusuntha mpweya kuti uziziritsa injini.
Injini ikakhala yozizira kapena ngakhale kutentha kwanthawi zonse, chowotcha chowotcha chimachotsa chowotcha choziziritsa chozizira cha injini, chomwe chimakhala kutsogolo kwa mpope wamadzi ndikuyendetsedwa ndi lamba ndi pulley zolumikizidwa ku crankshaft ya injini. Izi zimapulumutsa mphamvu, chifukwa injini sayenera kuyendetsa bwino fan.