What is the reason why the warm air of BMW 525 is not hot?

The reason why the BMW 525 heater is not hot is that the passage into the heater water tank is blocked, resulting in insufficient hot water in the heater water tank. BMW is a German automobile brand, which belongs to BMW Group. It has four models, I, X, Z and pure digital, and the M series (official high-performance modification department of BMW) improved on the basis of various departments. Take BMW 1 series as an example: its length, width and height are 4462mm, 1803mm and 1446mm respectively, its wheelbase is 2670 mm, and it is equipped with a 7-speed dual-clutch gearbox with a top speed of 2 12 km per hour. The fuel tank volume of this car is 50L, the maximum power 103kW, and the maximum power speed 1600 to 6500 rpm.