How do I know if my Audi's A/C needs to be recharged?

My Audi's A/C doesn't seem to be blowing as cold as it used to. How can I tell if it is time to recharge the A/C system?

The most common sign that your A/C needs to be recharged is if it is no longer blowing cold air. If this is the case, it is definitely time to recharge it.

Another way to tell if your A/C needs to be recharged is by checking the pressure of the refrigerant in the system. This should be done by a professional using specialized equipment.