How does lexus rx330 air conditional gas last

Hello, Air conditioning refrigerant is something that should never need serviced in the sealed air conditioning system. It is something that never deteriorates and never needs replenishing as normal maintenance. Think of your home refrigerator -- you never need to charge that, and it's the same concept. If you have warm air blowing, it could be as a result of several different causes. One possible cause is a leak of refrigerant, causing the system to not generate cold air. However, it's important to note that it could be caused by a different failure unrelated to refrigerant. Have a test performed to determine the source of the problem.