Overheating Issues!

I haven't been on my FABO in a while. Just been driving other cars than my satellite. Still having those Issues though. It does drive fine at 45mph as long as i'm not driving it hard off of the line and stuff, doesn't over heat at all. When it does "overheat" though is when I get on the freeway or at higher speeds/higher rpms. I bought some water wetter, but just haven't put it in yet. A flush is going to cost me over 100 bucks here in California, and I cant afford that at the time really. I want to mess with the timing a littel bit and see if it does anything, because this is the one thing that costs no money.

Where would be a good place to get a bigger fan at?
is there any way to check the water pump(if its gone bad or anything), besides seeing if it wiggles..? because it doesn't budge at all, but i'm still wondering if that could be my problem.
last question, is there anything I could do myself to fix a clogged radiator?

thanks everyone for any/all input!