http://lmgtfy.com/?q=Xbox+360+0102+fix+tutorial 0102 is the most common error code for 360's. That information is incredible easy to find. As for the overheating thing I would recommend download the fan speed xex hack. You can google that also. Or get a whisper fan.Jtaggers out their what's the best way to fix a rrod I'm trying to get it jagged and i dont want it overheat on me?
Discuss i know I'm teh noob
towel trick can harm your xbox in the long run take the time to follow Scarred"s (i think that is his username) tut on the xclamp fix. I use that exact method and fix TONS of 360s once you get it down good you can start charging on craigslist