I have a 2000 w/ an electric fan and I've had overheating problems. Of course, I also had a cracked manifold - could that be related to the overheating?

My overheating occurred when it was really hot out (~95) and I was driving on a steep uphill at about 80 with the A/C on. Turning the A/C off and slowing to about 70-75 would usually stop the temperature from rising, and but it would remain high until I started to go downhill again.