BYD g3 hot air conditioner doesn't work, but works when the temperature is low in the morning.

This situation does not mean that it is not possible at high temperatures. In fact, the poor cooling effect is an illusion. It is recommended to check whether there is insufficient refrigerant and whether there is leakage. Usually, the situation you describe will appear when there is a shortage of refrigerant. If there is something wrong with the car, ask the car master. 4S shop professional technician, 10 minutes to solve.