Why is the air conditioning not cooling even when the AC is turned on?

[StGriffin]

Here is an introduction to the car air conditioning AC button: 1. The AC button is the cooling switch for the car air conditioning. When pressed, the air conditioning compressor starts working, and the air blown out by the blower becomes cold. 2. For example, during hot summer days, to lower the temperature inside the car, press this button and turn the temperature selector switch to the blue part, and cold air will blow out. 3. If equipped with automatic air conditioning, simply press the AC button followed by the AUTO button. The automatic air conditioning will adjust the interior temperature based on the difference between the inside and outside temperatures.