Fan clutch fan ne mai sanyaya injin thermostatic wanda zai iya yin motsi a ƙananan yanayin zafi lokacin da ba a buƙatar sanyaya, yana barin injin yayi saurin dumama, yana sauke nauyin da ba dole ba akan injin. Yayin da yanayin zafi ke ƙaruwa, kamanni yana shiga ta yadda ƙarfin injin ke motsa fan ɗin kuma ya motsa iska don kwantar da injin ɗin.
Lokacin da injin ya yi sanyi ko ma a yanayin yanayin aiki na yau da kullun, kamannin fan ɗin yana ɓarna a wani ɓangare na injin sanyaya fan ɗin da ke tukawa da injina, wanda gabaɗaya yake a gaban famfon ɗin ruwa kuma ana tuƙa shi da bel da ɗigon ruwa da ke da alaƙa da crankshaft na injin. Wannan yana adana wutar lantarki, tunda injin ba dole ba ne ya fitar da fan.