There are some simple steps to follow.
1) Go to any autostore and get a thermostat (summer if possible) replace the one that is in your car. $5-8
2) Simply jumper the fan, and test it, or run a jumper on the sensor that sits right where you can see it on the aluminum IN-SPOUT.
3) If the fan does not come on, and stay on, after this replace it.
4) What condition is your rad in?
5) Buy some simple cooling system flush and run it through then dump and refill with new coolant $20-30.
Ok some tech hints......feel the temp of both hoses are they even?
When the car heats up is the over flow bucket bubbling out?
Finally....after all of this, the fan should only come on when you are sitting idling for prolonged periods. (like when at the drive thru)
Good Luck and feel free to ask anymore.
Sidler.
http://community.webshots.com/user/offroadaction
http://www.offroadaction.8k.com/