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Does the temperature gauge on your dash work okay?
The coolant temperature sensor provides a signal to the PCM to tell it when to turn the fans on and if its a three wire coolant sensor it also feeds the signal to the gauge on your dash and if the gauge on your dash is not working, it could be a clear sign that the sensor is dead.
However, to start with the simple things, first check the fuses that power the fans, it will be a large fuse probably in the under the hood fuse box and maybe in the 30A range. Check the fan relays as well.
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The fans run by a thermal switch separate from the temp guage. It is normally located on the rad. It has probably stopped working. Look around on the inside of the rad tanks and see if you can find a set if wires coming off a plug-in. It is likely near the bottom of the rad tank. Make sure you have a bucket handy when you pull it out, you will lose some coolant. Hope this helps.
The switch for the electric fan is in the radiator (it responds to the temperature of the water in the radiator, not the temperature of the water in the engine). With the engine running, if the switch has 2 wire on it, pull those two wires and briefly touch them together. If it has only 1 wire, tough that wire to ground. The fan should come on. If it does, the problem is the switch. If not, then the relay or the fan, or the fan's fuse is to blame.
3 things to check, 1st, temp switch (controls turning fan on and off according to eng. temp, 2. cooling fan control, tells switch when to turn on and off, and 3. fan motor. Check it to make sure it isn't shot.
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