What happened when the warm air of fsv in Jie Jun, China stopped and the cold air began to get hot? Is the small water tank blocked?

Hello, car owner In this case, if the thermostat is normal, the heating box is usually blocked. It is recommended to clean the heating box first, and then replace it if there is any fault. I hope it helps you and I wish you a happy life. If there is something wrong with the car, ask the car master. 4S shop professional technician, 10 minutes to solve.