They can either used dyed HCFC-22 refrigerant, and look for dye leakages, or they can use a halogen sniffer. Some DIY-ers say to cover your refrigerant lines with soapy water, and look for any instances of bubbling. This, however, is a bad idea, as it can lead to the mixture getting into the AC system and contaminating the refrigerant and compressor oil.
what parts
could be your a\c clutch in the compressor.?. or maybe pressure leaks.
check your coolent fill cap
Check your hoses for leaks or if they feel soft.
check to see if your fuse is blown.
Most AC leaks are at the compressor input shaft seal. But that doesn't mean that's the only possibility. Check other places too, but start there.
1997 cavaliers don't have petcocks, actually no cavalier has a petcock. you can check the bottom of your buddy's motorcycle to find a petcock most likey.
Usually leaks at hose seals or refill valve.You need a "blue light" to find the leak before it can be repaired.Most good ac repair shops will check it for a small charge. any place that there is an O ring will have the possibility of leaking.
How do you change a coil pack on a 1997 cavalier
Check for vacuum leaks,
You shouldn't have to, check for vacuum intake leaks
1997 Chevrolet Cavalier LS Front and Rear Tires P195/65R15 1997 Chevrolet Cavalier Base Model Front and Rear Tires P195/70R14 1997 Chevrolet Cavalier Z24 Front and Rear Tires P205/55R16