Usually we don't pay any attention to the A/C system of our vehicle until it stops cooling; nobody wants to be hot. There are many parts to the A/C system. This system is under high pressure and should be serviced by an A/C tech. Some of the parts in the A/C system are Evaporator, Condenser, A/C lines and hoses, filters, and Freon. All of these parts work hard for your comfort. When repairs are needed they can be expensive. Replacement parts with warranties can give you piece of mind. A correct repair starts with a good diagnostic job to hunt down the faulty part. Have your A/C system repaired by a tech qualified in A/C systems.
What are some simple checks one can do as an owner for A/C leaks, be it preventative measures of sure signs of why your A/C isn't blowing cold?
Check your hoses, especially where they are crimped (metal to rubber); if viewable, check for oil leak substance on lines and around condenser fins.
NOTE OF CAUTION:
Never release any form of refrigerant in to the air. *DO NOT TAMPER WITH HIGH AND LOW PRESSURE FITTINGS ATTACHED TO HOSES.* Refrigerant should never be released into the atmosphere as it damages the environment.