What is the reason why the warm wind is not hot in Pu Sang?

The reasons why the warm air in Pu Sang is not hot are: 1, the water tank or anti-freezing pipeline is blocked; 2. There is air in the antifreeze pipeline; 3. The water temperature sensor is faulty; 4. The air conditioner heater regulating switch is faulty; 5. The air duct under the instrument panel leaks or falls off. Pu Sang is a compact car with a length, width and height of 4475mm, 1706mm and 1469mm respectively, and a wheelbase of 2603 mm. The maximum speed in Pu Sang is 185km/h and that in tyre size is 175/70R 14. Equipped with brake assist, braking force distribution, tire pressure monitoring, child seat interface and engine start-stop technology.