Why is BYD f6' s main driver warm and cold, and the co-pilot hot?

First, the main reason is that the heat source is insufficient, and the air outlet of the passenger seat is close to the hot water pipe, which is slightly hot. 1, the weather is cold, and the temperature of the engine itself is low (the water thermometer is not in the central position). 2. Warm air radiator (commonly known as small water tank) is blocked, so hot water can't enter, just staying at the water pipe. Small water tanks have slow hot water flow rate, and some small water tanks have poor water quality and are easy to block. Second, the setting is improper. Such as wind direction, air volume control valve blocking, tripping, improper opening, etc. The air volume of the heater is too small, the wind direction is in the external circulation gear, the main drive is far away, and there is air leakage or blockage.