I have a 2016 f150 2.7 engine. I was driving down the highway and the temp gauge shot up and started over heating. I stopped immediately and got it towed home. I did notice some coolant but not much and it seems to be coming out of the reservoir tank. I changed out the thermostat stat and when I went to crank the truck on the temp gauge was still in the red. It’s been hours and still reading in the red. The truck does start, makes a small whining noise temporarily and it doesn’t seem like the hoses are getting hot or building up pressure. I understand it could be the water pump but no visible leaks. What I don’t understand why is the gauge still reading high!!!! Help!!! Any help is very much appreciated!!!

 

If it were mine, I'd undo the battery for a while.

 

I did. Left it disconnected for at least 30 minutes hoping it would reset but it didn’t.

 

maybe a bad coolant temp sensor?

 

Possibly the CHT (Cylinder Head Temperature) Sensor. There have been many documented failures. Ford treats it as a throw-away item. Once removed they recommend replacing it.

 

Looking into the cylinder temp sensor, that one I found but it could also be engine coolant sensor and I can’t seem to locate that sensor.

 

Here is a similar thread from a couple of weeks ago. It may be of some help?

2016-f150-2-7-overheating-after-thermostat-replaced-484197