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From what i know of these trucks, its a "common problem". There is a tsb on this and the gauges arent really accurate. The tow light is blinking due to heating(not really), its trying to tell you to stop towing. Ive read that some guys gauge is reading 250 which if it really were, the truck would be running. Water boils at 220(im sure u know that). Suggestions ive come across is adding aftermarket gauges that give "accurate" readings unlike factory ones that are controlled by computer. Aftermarket will give you independent readouts.Heres a temp check you can try on your truck, im not sure if it will work for your model.
This is for the regular dash, like in XLT. key off push trip button in and hold turn key on "test" will appear in message display. Release button. Gauges will sweep then just push the button each time to scroll thru various modes. Mostly junk info, but eventually you will come to temp, it is in Celcius so you have to convert to Farenheight(temp x 1.8 + 32) Normal temp for mine at idle is 88, so 88x1.8=158.4,+ 32=190.4F You can also view digital tach. All these modes are real time, and will remain on until you cycle the key on/off.
Make sure that the odometer is set to miles and not kilometers. Hold the button down (while in the regular odometer setting, not the "trip odometer" setting) until it changes to miles. The temperature display will automatically change to fahrenheit. We just figured this out today.