How to solve the problem that Ford Focus's air conditioner is not cold in hot weather?

On this issue, I went to 4S the day before yesterday to consult the master, and explained as follows: Fox's air conditioning pump is particularly small! The capacity is only 90 ml, and the average car is 120 ml, but the influence of low air conditioning power on the engine is also small, and the fuel consumption of air conditioning will not increase significantly! The master suggested that when turning on the air conditioner, it is best to turn on the second gear. The second gear is the most suitable air volume and cold air volume. If the air volume is increased, the air volume is not enough. At the same time, the internal loop is opened.