Last Friday, I drove to my parent's home with a new condenser (decided to replace the condenser because it was the only element close to the hissing sound that I could not see). It wasn't too difficult of a job, I intended to do a proper write-up, but with a heat index of 110 degrees in Grand Rapids, MI area, I didn't want to dick around with a camera. Sorry guys.
Anyway, when I pulled the condenser out, I immediately noticed an area that was very damaged and chewed up. Funny thing, the damage was on the radiator side of the condenser! The other side of the condenser showed no damage whatsoever, and the radiator appeared to be in decent shape as well. I can't say for certain what caused this damage, but after replacing the condenser, vacuuming down the system for about an hour, and adding refrigerant, I've had nice, ice cold air for a few days now with no sign of any other leaks.
I'm happy to answer any questions about this process and my findings if it'll help anyone else with a similar issue. Also, I have a picture of the damaged condenser that I can upload as well.
