I have a 06 F 150 that I’m having problems with. After the truck has warmed-up (10 min) I get an alarm, the temp gauge from normal to max instantly and the screen on the dash tells me to “reduce engine power”. After this happens I can restart the truck and it might be 1 min. to 20 min before I get the alarm again. I took the truck to auto zone and they told me that I had a high cylinder temp. What is odd is that I live in Chicago and had this started at the end of last winter, not at all during the summer then again this winter. When the temperature is above 50 I don’t have the problem. I think it is a bad sensor but don’t know. Can anybody please help me figure this out.

Thanks
Steve

 

Sometimes with a blown head gasket you will get a large bubble of hot air from a combustion chamber in the cooling system that will pass through (it can move around) the intake manifold and trigger a over temp engine via the temp sensor. Is the cooling system getting over pressurized and blowing coolant out of the degas bottle? If you suspect a blown head gasket get a Hydrocarbon test performed of your cooling system or rent a kit from Auto Zone or another auto parts store and perform it yourself