Running a little hott

Lately my 93's been running hot. After driving for around 20 minutes, the temperature is just over the half way mark. I can hear the fan kicking in, but the temperature barely lowers (goes just below half). When I come to a stop, the car runs quite rough and everything starts vibrating. What can I do to keep it cool? Ive also noticed that when the fan turns on, you can hear it vibrating in the car. I took a look at it and it looks as if the fan blade is a bit off set, so that when it turns, it doesnt do a good circle, it moves around a bit. Could this be a problem? Would this stop the fan from reaching full rpm?
Any help would be great. thanks

can anyone help me out? lol., im gonna be doing some highway driving next week, and i dont want to poor thing to overheat.

It's cooling ability will be greatly affected if it's off-balance. Replace it. Though I doubt it would be that much of a problem on the highway... assuming that's the only thing wrong with it. Make sure all your hoses are in good condition.

Ok. so now i've come to a conclusion that I'm gonna replace the fan. What is their value?

I think they are around $70 or so.

A) go to your local GM dealer
B) shop online (http://www.google.com/search?hl=en&lr=&q=cavalier+parts)