What is the reason why the storage box in front of the co-pilot of the old Mazda 3 and Xingcheng gets hot after driving for a long time?

The storage box in front of the co-pilot of the old Mazda 3 Star is getting hot after driving for a long time because it is the installation location of the heater water tank. According to the query of relevant public information: Mazda 3 Star It is normal for the storage box in front of the co-pilot to become hot after driving for a long time. This is the installation location of the heater water tank. When cooling is not used, the water temperature will be transmitted. The water inside is the cooling water of the engine. The engine water is normal. The rear temperature can be as high as 98 degrees, so you will feel hot.