Why does my car open the warm air door and the water temperature is high?

Hello! It may be that the engine cooling water is not enough. When you turn on the heater, some water will flow through the heater box and back to the engine block. Check whether the cooling water is sufficient. I hope my answer is helpful to you! If there is something wrong with the car, ask the car master. 4S shop professional technician, 10 minutes to solve.