Best bet would be to get a Helms manual and trouble shoot it. If that's too steep for ya, even a cheapo Haynes manual will have troubleshooting in it. I have one for my wife's civic, and while I wish I put the $15 towards a Helms for it (I have a Helms for my Accord) it still had enough info to trouble-shoot her overheating problem.

Check the fuses, relays, wiring. Then check the thermoswitch, thermostat, etc. Is it overheating? Does the AC not work?