Why is the warm air not hot when the water temperature doesn't come up?

The air conditioning filter element is dirty and blocked. 1, which will lead to much less wind blowing and affect the heating effect of warm air; 2, the water temperature sensor is broken, the water temperature sensor is always on, or the water temperature sensor is turned on too early, which makes the refrigeration system carry out a large cycle too early; 3. If the outside temperature is very low, when the car is running, the cold air will quickly refrigerate the antifreeze, the engine water temperature will not come up, and the warm air will not be hot. When the car is cold, touch the water inlet pipe of the water storage tank to see if there is any liquidity of frozen liquid, or open the lid of the water tank to see if there is any liquidity of frozen liquid. After the water temperature rises gradually, feel whether the upper and lower pipes are hot and humid. If there is water flowing and the water pipe is hot and humid, it means that the water temperature sensor is always on. If there is no fluidity of water, the water pipe is cold, indicating that the water temperature sensor is not turned on. The impeller is damaged or stuck, which leads to insufficient flow through the small warm air storage tank and the heat energy can't come up. There is air resistance in the engine refrigeration system, which leads to poor circulation of the refrigeration system, resulting in high water temperature and no warm air. The vehicle heater uses a fan to blow the heat energy of the small heater storage tank into the vehicle cab. If the warm air pipe is blocked, the heat energy of the small warm air storage tank cannot be released, which will also lead to the temperature of the warm air not rising.

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