The water temperature of BMW 5 Series is high, the water overflows after boiling, and the warm air drops to the highest temperature and returns to normal. What is the reason?

You drink very well. I'm glad to answer this question for you. The main reason is the poor heat dissipation of the water tank. The warm air is turned on to the maximum, which is equivalent to two radiators. I suggest checking the water tank. I hope it works for you. Have a good car. Ask the car master. 4S shop professional technician, 10 minutes to solve.