Hey, So I found a black wire inside my AC. The wire seems to be coming from the keypad (where you can change the temperature, mode, etc). You can see the wire when you open up the front of the AC in order to clean out the little dust collector. Can the wire be hazardous in any way? It's a black wire that leads inside the keypad (But I can't see where, just slips through the bottom corner. The wire wasn't connected anywhere before (at least that's what it seems like). It seems to be wrapped as in the wire wasn't cut and the cooper never peeled out. So yeah, I'm kinda clueless now. Any help would be great! Thanks.

I've got an old 3 ton Carrier Compact system, installed in 1974. I purchased the house 4 years ago, the people who I purchased it from had a 2nd home and told me they didn't use the a/c to much as they were away most of the summer. All maintenance records indicate it was serviced regularly. I'm hands on, I clean all the coils, filters etc. The unit is extremely clean, both condenser and evaporator units. Even on 90 degree days my house is very comfy and it cycles. Being I cannot check refrigerant levels I though it might be a good idea to have a once over by an a/c tech. Here's what we found. 86 deg. outside (evening) temp. 76 indoors at the return low pressure was at 58 psi Didn't get the high pressure reading Suction line was sitting at about 60 deg at the condenser I'm blowing 58 deg. air Tech said he might be able to make it cooler, but then couldn't add R22, said the system wouldn't suck anything in? That didn't make any sense to me. He also stated the compressor is probably tired and I should be thinking about replacing the whole system. Hummm???? Should I be alarmed or is this system working as it should? Again, my house is very comfy, some might even say it's cold inside!! The system is 38 years old. Air handler in the attic, (cape style home) return up high with discharge in the ceilings. I can maintain 78 upstairs on days near 100 deg. and downstairs at 72. It will even cycle on days like that! I have the trunks throttled to give more flow upstairs because we like to sleep cool (70 at night). Thoughts? Does this old beast still have some life left? Thanks for your input.