Our shop does quite a bit of automotive air conditioning service and repair. We feel that we see too many AC systems not working efficiently or having catastrophic failures. We have been performing automotive air conditioning service and repairs since the mid 1980s and have found more frequent failures with the introduction of R134a refrigerant. It was not widely known then that even a 10% undercharge would promote damage to the AC system. We discussed this while attending the regular Mobile Air Conditioning Society shows and seminars. R134a was difficult to contain when first introduced. When we ask why there is so many failures now, the biggest answer is lack of regular service or maintenance.