Fann radiyo wani muhimmin sashi ne na tsarin sanyaya injin mota. Tare da ƙirar injin sanyaya injin auto, duk zafin da ke sha daga injin ana adana shi a cikin radiators, kuma fan mai sanyaya yana busa zafi, yana hura iska mai sanyaya ta cikin radiator don rage zafin sanyi da kuma kwantar da zafi daga injin mota. Ana kuma san fan ɗin sanyaya a matsayin fanan radiyo saboda an ɗora shi kai tsaye zuwa radiator a wasu injuna. Yawanci, fan yana sanyawa tsakanin radiyo da injin yayin da yake hura zafi zuwa yanayi.