Need some help here. I have a 1981 Sears/Roebuck Air Condenser unit. 3 weeks ago, the fan outside stopped and the air inside the house blew warm air. Called a local HVAC company and they said it was dirt on the fan motor. The cleaned it off and filled up the freon and it worked...for 2 days. Same thing happened, same company came back out, and they said the capacitor and fan motor needed replacing ($~200). Paid it and it's been working for the past 2 weeks.
Now, when I came home today, the fan outside was blowing, and all seemed normal, but there was no air what so ever blowing in the house (warm or cold). I noticed that on the back of the compressor unit outside that the pipe between the compressor and house was frozen (well..* between where the pipe goes into the unit and stopped at the insulated black part). Anyway I turned off the unit, let it thaw, went back outside and was able to gently chip off the frozen part... and it's still not working.
Because we've paid a few hundred dollars for this already... if I don't turn on the unit overnight, is there a possibility that it will work tomorrow morning? What else could be wrong? I searched on yahoo answers and various websites, and I've read equal parts low freon, running it too much, and other reasons.
And I know...I'm lucky a 30 year old unit is still working, but we're trying to hold off on plunking down 3k for a new heat pump. Any advice is appreciated!