Fan clutch ndeye thermostatic injini yekutonhodza fan iyo inogona freewheel pane yakaderera tembiricha kana kutonhora kusingade, ichibvumira injini kudziya nekukurumidza, kusunungura mutoro usingakoshese painjini. Sezvo tembiricha dzichiwedzera, clutch inobata kuitira kuti fan inotyairwa nesimba reinjini uye inofambisa mweya kutonhodza injini.
Kana injini yatonhorera kana kutodziya tembiricha yekushanda, fan clutch inobvisa zvishoma injini inofambiswa neradiyeta yekutonhodza fan, inowanzowanikwa kumberi kwepombi yemvura uye ichityairwa nebhandi uye pulley yakabatana ne crankshaft yeinjini. Izvi zvinoponesa simba, sezvo injini haifaniri kutyaira zvizere fan.