The Wuling Light heater does not work and keeps blowing cool air. First, make sure the water temperature of your vehicle is normal, and then check whether the heater water tank switch inside the front hood of your vehicle is turned on? Then when the vehicle is just started and the vehicle is heating up, check the temperature of the two heater water pipes yourself. If you find that one is hotter and the other is cooler, your heater water tank may be clogged and needs to be cleaned