there are a few things that control the fan operation... even though the fuse is not blown for the fan or the fan is not locking up u may still have a bad fan motor. try applying power to it and see if it works. if not the fan is obviously bad. If it does work, check the fan control relay. you should have a 4 pins to choose from, 2 should have power at all times and 1 should be grounded at all times, 1 should ground when the fan is activated by the computer. Other things i have seen go bad are the ect sensor which tells the computer how the engine is. it is not the guage temp sender. hope i've been some help.