Of course this would happen on the weekend. The A/C unit runs, the compressor is running, but the air is not cold. The thermostat is set for 73, but it is actually 77 in the house. I checked the compressor unit outside, and it is running, but the line attached is not cold or sweating condensation like it does when running properly. We did change the compressor fan motor in the past year or 2. The compressor is a Goodman 3.5 ton and is 14 years old. Any ideas?