Ifeni yerediyetha iyingxenye ebalulekile yesistimu yokupholisa injini yemoto. Ngokuklanywa kwesistimu yokupholisa injini ye-auto, konke ukushisa okumuncwa enjini kugcinwa kurediyetha, futhi isiphephetha-moya esipholile siphephetha ukushisa, siphephetha umoya opholile nge-radiator ukwehlisa izinga lokushisa elipholile futhi sipholise ukushisa injini yemoto. Ifeni epholisayo yaziwa nangokuthi i-radiator fan ngoba ifakwe ngqo kurediyetha kwezinye izinjini. Ngokuvamile, isiphephetha-moya simi phakathi kwerediyetha nenjini njengoba iqhumisa ukushisa emkhathini.