Paipi ya radiator ndi payipi ya rabara yomwe imasamutsa zoziziritsa kukhosi kuchokera pa mpope wamadzi wa injini kupita ku radiator yake. Pali mipaipi iwiri ya radiator pa injini iliyonse: payipi yolowera, yomwe imatenga choziziritsa cha injini yotentha kuchokera mu injini ndikuchipititsa ku radiator, ndi china. ndi payipi yotulukira kunja, yomwe imanyamula choziziritsira injini kuchokera pa rediyeta kupita ku injini. Pamodzi, mapaipi amayenda choziziritsa kukhosi pakati pa injini, radiator ndi mpope wamadzi. Ndiwofunikira kuti injini yagalimoto ikhale yotentha kwambiri.