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In reply to the discussion: I'm so sick of being poor [View all]Warpy
(114,445 posts)It's something I discovered during my latest several year poverty period. As long as I could keep the Antichrist (a cheap computer that liked to eat its hard drives) running, I could find out how to fix most things. I literally have WD 40 in every room of my house now, I call it "holy oil."
Anyhow, for central air, http://home.howstuffworks.com/home-improvement/heating-and-cooling/how-to-repair-central-air-conditioners1.htm is a good troubleshooting guide that will tell you if it's a problem you can fix or if you have to sell your first born to get somebody else to fix it. Do SHUT THE POWER OFF before you open the cover.
A deeper explanation and guide is at http://inspectapedia.com/aircond/aircond1123.htm
There are more sites than just those two, they're just the first I found. I was lucky, I have a swamp cooler instead of refrigerated AC and it mostly works OK because it's so arid here.