Hissing Olds Bravada

Just purchased a 2000 Olds Bravada and the a/c isn’t running so good. It got a complete clean bill of health for the bank to finance but I’m not so sure it’s healthy. It makes a hissing sound when the a/c is running and the a/c isn’t running cool. Any thoughts appreciated.

the ac system may be low on freeon causing it not to blow cold, or the compressor may be going bad

Thanks, that’s what we were thinking. We’ve talked with the guy we brought it from just Friday and after giving this car a totally clean bill of health, his response is… cars break down. He is however willing to check it out.