radiator fan not turning on...suggestions?

see my video, vida said "signal missing".
https://youtu.be/cA0OSCA27WM

What year and model is your car? On the P2 cars the fan is triggered by the same sensor that feeds the temp gauge. So if the temp gauge is running mid-range then it’s likely the sensor is OK. The fan controller that is mounted integral to the fan motor assembly is often the culprit. The controller gets a signal from the ECM via the purple wire that it wants the fan engaged. The fan controller then acts as a sort of “relay” that turns on the fan via the larger gauge wires. Have you checked the fan fuse?

When is it not turning?

Be careful, the fan can run without the car being on.

If you plan to mess with the fan - either unplug it or disconnect the battery,

Can you turn the fan by hand - if not the ban is seized and most likely needs to be replaced.

Can you connect 12 volts directly to the fan plug? If this does not cause the fan to run, possibly you have a bad fan. If it does run, you most likely have a bad switch - usuallu attached to the radiator.

If you do not have the ability to do these tests, I suggest that you go to a dealer for help - NO FAN CAN CAUSE THE DESTRUCTION OF YOUR ENGINE. Over heating is a common cause of today's engine failures.

If you have a later model without a temperature gauge, damage to your engine without any warning.

If you have a temperature gauge, because of its design - if it goes above normal, the temperature may be REALLY high.