One possibility is that the AC unit is not working properly. If it is not working, you may need to try changing the filters or checking the breaker.
Yes, adding coolant can help AC work better.
No, driving does not make AC colder.
There are a number of different settings that can be used for car AC. Some people prefer to use a setting that is comfortable for them, while others prefer a setting that is more powerful.
There are a few things to look for in order to determine if your car needs coolant. If the car is not starting, it may need new coolant. If the coolant level is low or the air conditioning doesn’t work, the coolant could be drained and needs to be replaced.