I would have expected mine to work this way.Ģ) I've seen the pics others have posted where thier truck displays an actual temperature also. Shouldn't I be able to tell its getting hot before the warning message appears? One of the pics on this thread shows the guage in about a "3/4" position when hot. Isn't the guage supposed to move as the temperature changes. When the warning message came on, the little temperature symbol turned red, that's it. And again completed the rest of the trip without AC.ġ) How is the temperature gauge on my dashboard supposed to operate? Because, the whole time it was sitting right in the middle, at "50%". Only this time, it took less than a hour of the AC being on when the warning came on. Next morning, checked the coolant again, not low, so headed out. Completed day 1 without the AC on and no more warnings. Pulled over right away and let it cool for 30 minutes. Ran for another hundred or so (almost 2 hours) and got the 1st warning. First day, ran for a hundred miles and stopped for a break/lunch. Once each day I got a warning that the coolant was overheated. Just completed my first RV tow, spread out over two days. Thanks everyone for the input.I have a new 2021 Powerboost with 3K miles. I will post what I find during the repair. I am going to concentrate CHT sensor, and will look at the thermostat will change the coolant. In any event I have been unable to put my finger on a ECT sensor. Even though the code reader gave me a temperature of the engine coolant temperature I also read that the CHT sensor calculates this parameter. That explains the engine laboring when it first occurred. I read somewhere that the control module disables 4 of the fuel injectors, alternating the 4 disabled injectors every 32 (I think it said) cycles in an attempt to keep the engine cool. I also noted that the AC kicked off, the cooling fan went to high speed the engine temp gage dropped to 0 which may all be the control units response to the false signal. I wouldn't think that 191 is overtemperature. what I saw was that when the CHT reached 191 degrees the overtemperature light came on. So I put it in the live data mode and ran the truck. I captured the operating parameters And ECT sensor temp was 181. I acquired a code reader and it threw a code of P1289 which is pointing to the CHT sensor. Thanks for reading this long post and any ideas would be appreciated. Any ides as to what is causing this to happen? I think one of the sensors is going bad but am afraid that if I continue to drive it I will be stranded if it ever goes into limp mode. Continued to drive and transmission temp reached 180 after about 8 miles or so transmission gage began to slowly climb to normal. Checked the digital readout and the transmission temp was 170. Started driving again and transmission gage was bottomed out. So I killed the engine after a few minutes (3 or 4) started the engine back fan on low speed. Stopped again and checked upper and lower hoses same as before and radiator was relatively cool to touch. After 4 or 5 miles noticed the AC quit working the and the over temperature light came on for the engine. Started driving again and the engine seemed to be struggling temp gage still not working. Pressed the ok button, stopped and checked the coolant level as ok upper and lower radiator hoses were warm but not too hot to hold. Press OK." A quick glance at gages showed the engine temperature gage bottomed out on cold side, Transmission temp gage in normal range. While driving on 4 lane, light traffic outside temp ~70 degrees a warning light came on saying something to the effect of "Warning excessive engine temperature. I have a 2014 F150 4wd 5.0 L with elec 6 speed automatic and factory towing package.
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