During the operation of a car, the engine combustion generates a large amount of heat, but the engine temperature should not be too high, otherwise problems such as cracking and deformation, poor oil lubrication, and increased wear may occur, resulting in a shortened service life of the engine. ???? ?? ??? ??????? ?? ??????? ??????? ??? motor. ?? ????? ??? ??????? ??????? ???????????? ???????? ??? ??? ??????? ???????? ?????. ? ????????pump ??? ??????????? ???? ??? ??????? ? ?????, ????? ??? ???????? ???? ?? ?????????? ?? ???????? ???? ???? ??????? ??? ??????????????? ?????? ???????????? ???? ?????????? ????? ?????: ????? ???? ??? ???? ????. ???? ??? ??? ??? ?????? ?????????, ?? ??? ??? ?? ????? ???? ?????, ???? ???????? ??? motor ?? ???? ????? 80° ??? ???? ??? ???????? (??? ???????????? ???????????? ??????? ?????? ??? ??? ??? ??????). ???? ??? ??????????? ??? ??????????, ??? ??? ??? ? ??????? ?????? ????????? ??? ?? ????? ????, ??? ???? ????????? ??? ??? ??? ???????pump ?????? ?? key role ??? ??? ???????????. ???? ?? ??? ?? ???????????? ??? ???????pump, ?? ???? ????????? ??? ?????? ? ? ? ??????????? ??? ??? coocoocooling ??????. Gener?????speaking, ???? ?? ???????pump ??? ??????, ?? ????? ?? following sympsymptoms: 1. ?????????????????????????????????????????????????????????????. ??? ???????????pump ??? ??????????? ?? ?? ?????? ?? drawdrawdrawdrawdrawdrawdrawdrawdraw??????????????????????????????? ???, ?? ??? ???? ?????? ????? ???????????? ??? ???????. 2. ??????????????????????? ??? ?? ?????????? ????, ???? ????? ?? inadequate sealing and engine leakage near the water pump. ???????? ??? ????????? ???? ????? ??????? ??? ???????????????? ???? ?? ?????????????????? ??? ?? ???????????????, ???? ?? ?????????? ??? ???? ???????????????????? ???? ????? ??? ?????????. ??? ??? ???????? ?????, ???? ???????? ????? ???? ?? ???????? ??? ??? ???????????????, ?? ???? 3. ??? ?????????? ???? ??? ??????? ??? ??? ??? ??????????????? ???? ???????? ???????????, ?? ??? ?????? ??? ?? ??????????????? ??? ????????? ?? ????? ???????, ??? ??? ???? ??? ??? ???? ??? ??? ?????? ??? ?? ????????? ??????? ????? ??? ??????? ??? ??? impeller, ????? ???