A ruwa famfo ne wani bangaren na abin hawa ta sanyaya tsarin da circulates coolant ta cikin engine don taimakawa wajen daidaita da zafin jiki, yafi kunshi bel pulley, flange, bearing, ruwa hatimi, ruwa famfo gidaje, da impeller.The ruwa famfo ne kusa da gaban injin toshe, kuma bel ɗin injin yakan tuƙa shi.