How to put freon in compressor

There is a low pressure port to add the freon. You need to add a dye to find the leak as it does not just go away without a leak.

I suggest you let a shop at least check it for you to verify the leak.

Roy

Just to add to this one the 2000-2002 S model saturns its common for the ac clutches to fail. When you turn the ac on does the radiator fan come on and the ac clutch on the ac compressor turn on?

These systems require a very specific weight of refrigerant. You can do severe damage with the wrong amount so I strongly advise against arbitrarily adding refrigerant when that may not be the problem at all.