The warm air in Mazda Artz is 23 degrees, so I can't feel very hot.

The control device of warm air is not working properly. Mazda Artz heater is not very hot when it is adjusted to 23 degrees, which is caused by the poor control mechanism of the heater. The method of discrimination is: 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.