What is the reason why the van warm air is not hot?

1 The vehicle heating system is not hot, which can be divided into two reasons, one is caused by the engine cooling system, and the other is caused by poor operation of the heating control mechanism. When maintaining, we must first determine which cause it is, and then carry out corresponding maintenance. The method of discrimination is simple. Look at the temperature of the two inlet pipes of the warm air small water tank. If both pipes are hot enough, there is something wrong with the air flow control mechanism. On the contrary, if both pipes are cold, or one is hot and the other is cold, it is a problem with the cooling system. \ r \ The possible problems of N2 refrigeration system are: \ r \ N21The thermostat is always on or the thermostat is turned on too early, which leads to premature large cycle of refrigeration system and low external temperature. Especially when the car is driving, the cold air will quickly cool the antifreeze, the engine water temperature will not go up, and the warm air will not heat up. \r\n2 is that the impeller of the water pump is damaged or lost, which makes the water flow through the small warm air tank. If there is gas in the cooling system all the time, it is likely that the cylinder pad is damaged and the gas leaks into the cooling system; If the inlet pipe of the small heating tank is very hot and the outlet pipe is very cold, this situation should be that the small heating tank is blocked and should be replaced. \ r \ nThe heater is not hot: \ r \ nSolution: The heater of the car uses a blower to blow heat from the small heater tank into the cab. If the air volume is insufficient or the distribution of cold and hot air is not good, the heat of the small warm air tank will not be radiated, and the temperature of warm air will not rise. At this time, first check whether the filter element is dirty and blocked, clean it, and replace it in time if necessary; Then check the operation of each gear of the blower, and each gear must reach sufficient speed. If the knob is set to the warm air position, the air volume is large enough and the wind direction is normal, and the cold air is blown out, check whether the cable of the hot and cold air control flap in the warm air box falls off, whether the warm air impeller is damaged, whether the flap falls off, etc. After troubleshooting, the warm air will get hot.