There are two reasons why the automobile heating system is not hot: one is the engine cooling system, and the other is the poor operation of the heating control mechanism. When carrying out maintenance, we must first determine what the reason is, and then carry out corresponding maintenance. The discrimination method is simple: look at the temperatures of the two intake pipes of the small warm air tank. If both pipes are hot enough, there is something wrong with the air volume control mechanism. On the contrary, if both water pipes are cold, or one is hot and the other is cold, there is something wrong with the cooling system.
Possible problems in cooling system
If the thermostat is always on or turned on too early, the refrigeration system will have a big cycle too early and the outside temperature will be very low. Especially when the car is running, the cold air will quickly cool the antifreeze, the engine water temperature will not rise, and the warm air will not generate heat. The impeller of the water pump is damaged or lost, which makes the flow through the small warm air tank insufficient and the heat can't come up. There is air resistance in the engine cooling system, which leads to poor circulation, high water temperature and much hot air. If there is air in the cooling system all the time, it may be that the cylinder pad is damaged and the air flows to the cooling system; If the inlet pipe of the small heater water tank is hot and the outlet pipe is cold, the small heater water tank should be blocked and replaced.
Problems of air volume control mechanism
If the air volume is insufficient or the distribution of cold and hot air is not good, the heat in the small warm air tank will not dissipate, and the temperature of the warm air will not rise. At this time, first check whether the filter element is dirty, clean it and replace it in time if necessary. 2. Check the operation of each gear of the fan, and each gear should reach sufficient speed. If the knob is set to the hot air position, the air volume is large enough and the wind direction is normal, and cold air is blown out, check whether the hot air box controlling the flap cable to cool the hot air falls off and whether the warm air impeller is damaged. After troubleshooting, the warm air will heat up.
What if the warm air is not hot at last? Because the heating system of the car is not used for a long time, it is inevitable that there will be many minor problems. As a car owner, you can do the following steps first: check the hot and cold windshield to see if the air conditioner is adjusted to the hot windshield; Then check the electronic fan temperature control switch; And check the water thermostat. If not, please hire a professional expert.