What's wrong with my temperature system in my ford focus 2010? See details?

So I was driving for about 20 minutes and my temperature gauge was on cold still for some reason. Then all of a sudden my temperature warning light turns on, and persists for about 10 minutes. Then the temperature light turns off, and my gauge moves from cold to right before the middle. Is it a faulty sensor? Or could my car be overheating within 20 minutes of driving?

I have a ford focus 2010.

Could be several things. But the main thing is when the light comes on showing it overheating you are to STOP right then not just keep driving until it goes out or whenever its convenient… Have it checked out as soon as possible as you could of even ruined and engine.

"temperature warning light turns on, and persists for about 10 minutes". Always stop the car immediately whenever it is showing a warning light. Please see a mechanic and hope it was just a bad sensor.

Temp system is cold

It is possible the gauge is bad, and the sensor is fine. That would explain why the warning light worked, even through the gauge read cold. As others have stated, if the temp warning comes one, you should IMMEDIATELY stop and shut of the car. You need to have the problem diagnosed and fixed As soon as possible. Don't drive the car any more than ABSOLUTELY necessary until you do. By absolutely necessary, I mean there's literally a life at stake.

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