Tanki yokulitsa imagwiritsidwa ntchito kwambiri pakuzirala kwa injini zoyatsira mkati. Imayikidwa pamwamba pa radiator ndipo imakhala ndi thanki yamadzi, kapu ya tanki yamadzi, valavu yochepetsera kuthamanga ndi sensor. Ntchito yake yayikulu ndikusunga magwiridwe antchito anthawi zonse a dongosolo loziziritsa pozungulira pozizirira, kuwongolera kuthamanga, komanso kulolera kukulitsa koziziritsa, kupeŵa kuthamanga kwambiri ndi kutayikira koziziritsa, ndikuwonetsetsa kuti injini imagwira ntchito pa kutentha kwanthawi zonse ndipo ndi yolimba komanso yokhazikika.