Why the cooling fan fuse has no power/fuse is good?

The cooling fan is controlled by the coolant temperature sensor near the thermostat, and when it senses too high temperature of the coolant, it operates the fan relay.
Check the fuse for the cooling fan, the cooling fan relay, and the fan itself for proper operation. You can use a multimeter to see if power is getting to the sensor. If not, and you find the fuse is good, then you'll have to find the break in the wire.

You still have many other components in that system that has to be in working order for the cooling fan to work properly. The cooling fan is turned on when engine temp reaches a predetermined temp, usually around 220-230 degrees F. the ECT (engine coolant temp) sensor siganls the ECM (Engine Control Module) to ground the cooling fan relay or cooling fan module(if equipped) and if the cooling fan fuse is good and the fan has power to it the realy will complete the ground for the fan to run. You may need to have a qualified technician diagnose the problem if the obvious things like fuses and good grounds are not the problem.

Hope this helps.

broken wire

The radiator cooling fan on your 1990 Ford Thunderbird Super-Coupe is supplied power via the BLACK, 18 Gauge, fusible link near the battery.
If your cooling fan is not getting any power to operate (and you are certain that the fan motor is in good working order) the most likely cause of you fan not working is a failure in the Constant Control Relay Module (CCRM), which is mounted to the upper radiator support.

I have replaced many of these because the circuit boards inside them like to burn.

HERE IS HOW TO TEST IT:

Check for power at the CCRM on pins 3 and 4 BLACK/ORANGE wires. If there is power there, the fusible link is good. If there is no power at these connectors, repair the fusible link or the circuit between the fusible link and the CCRM.

Then, the Powertrain Control Module (PCM) turns the fan on by grounding the fan relays inside the CCRM at Pins 14 and 17.

So if you have power on the BLACK ORANGE wires, You should be able to manually turn the fan on by grounding Pin 14 (TAN/ORANGE) for fan LOW speed and Pin 17 (GREEN/PURPLE) for fan HIGH speed.

If grounding these wires does not get the power to come on at the fan motor, then the CCRM needs to be replaced.

If this makes the power come on (at the motor connector) but the motor will not run, then you need to replace the fan motor.

If grounding these wires makes the motor run, you have a problem with the engine coolant temperature sensor or the PCM.

The fan is powered by multiple control points. The first thing to check is fuse for cooling fans. If fuse is good then check the fan relay(s). After making sure those 2 items are good then check temperature sensor on the engine. Those are the main items that control cooling fans. Some vehicles are also controlled through the ECM.

the cooling fans on your car are comanded on by the engine control module which reads engine temperature from the temperature sensor . when comanded on the engine control module sends a signal to the cooling fan relays . which in turn runs the current to the cooling fans . So you might want to check the cooling fan relays and make sure the fues for the cooling fans are good and the relays .if the cooling fan fuses and relays are good it could be a problem with the fan motors or the engine control module not reading the right temperature in that case it could mean you have a problem with the temperature sensor

Is your AC system charged and working? I believe the pcm will not activate the fan unless the AC system is operational.

 buy manual, see if fan runs with alt power source(jumper wires), check temp sending unit 

The fan could be bad..
Teat for power to the fan.. If thre is power - that fan needs to be repaced..

Hope this helps !1
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