What if the Reiz heater is not hot?

There are two reasons why the vehicle heating system is not hot: one is caused by the engine cooling system, and the other is caused by the poor working of the heating control mechanism. In the process of maintenance, first determine the reason, and then carry out the corresponding maintenance. The discrimination method is simple. Look at the temperature 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; If both water pipes are cold, or one is hot and the other is cold, there is something wrong with the cooling system. The possible problems of the cooling system are: the thermostat is always on or turned on too early, which makes the cooling system circulate too early and the outside temperature is very low. Especially when the car is running, cold air will quickly cool the antifreeze, the engine water temperature will not rise, and the air will not become hot.