Solution: replace it with a new warm air tank and light the fire. Wait a while, and the water temperature will rise slowly. At about 90, turn on the warm air switch and the hot air will come out. Troubleshooting. The main reason is that the warm air tank is dirty and blocked.
Extended information When using the car heater, you can't smoke in the car, because it is in a closed environment, the smoke generated by smoking will not be discharged immediately, which will lead to yellowing of the interior and endanger your health. The position of the vehicle's warm air outlet cannot be blown directly on the face. You can switch to the blowing block mode and the foot blowing mode.
There is no need to turn on the AC switch of the vehicle. Once the AC switch of the vehicle is turned on, the compressor of the vehicle will work. The operation of the compressor will cool the vehicle. The heating system of the vehicle is started by the heater of the vehicle. It must be noted that the highest temperature cannot be selected when choosing the temperature, so as to avoid overheating of the air inside the car.