The source of car heating is the heat of the engine. Warm air is delivered to the car through the coolant circulation device. If you say the car does not have heating, there are several considerations:
1. Is the engine water temperature normal? Is there enough heat?
2. Are there blockages or leaks in the heating air pipes?
3. Are the heater switch and heater circulation mode selected normally?
4. When turning on the heater, are you always turning on the external circulation device?
The problem is not complicated. You can first check whether a few switches are selected appropriately. If you are sure that there is no problem with the switch, it is better to go to the store to check. Hope I can give you some help. 1. The car's warm air uses a blower to blow the heat from the small warm air water tank into the cab. Insufficient air volume or poor hot and cold air distribution prevents the heat from the small warm air water tank from dissipating, which will cause the temperature of the warm air to drop. Can't come up. At this time, consider whether the filter is dirty and clogged, whether the blower operates at sufficient speed in each gear, and whether the heater box is faulty.
2. The thermostat is always open or the thermostat is opened too early, causing the cooling system to undergo a large cycle prematurely, while the outside temperature is very low, especially when the car is running, the cold wind quickly kills the antifreeze. With liquid cooling, the engine water temperature will not rise, and the heater air will not heat up.
3. The impeller of the water pump is damaged or lost, causing insufficient flow through the small warm air water tank and preventing heat from coming up.
4. There is air blockage in the engine cooling system. The air blockage leads to poor circulation of the cooling system, causing high water temperature and lack of warm air. If there is always air in the cooling system, it is likely that the cylinder gasket is damaged and air is flowing into the cooling system; if the water inlet pipe of the small heater water tank is very hot and the water outlet pipe is cold, this situation should be that the small heater water tank is blocked. , the small heater water tank should be replaced. It may be caused by the engine cooling system and the heater control mechanism not working properly. The method of identification is very simple. Look at the temperature of the two water inlet pipes of the small heater water tank. If both pipes are hot enough, it means there is a problem with the air volume control mechanism. On the contrary, if both pipes are cold, or one pipe is hot and the other is hot. If it is cold, it means there is a problem with the cooling system.