cdrgoose

I have purchased a used 2020 AT4 with a 3.0. I have had diesels for well over 20 years. Always plugged in when it was freezing or lower outside temperature. Never a problem. Why did they change things soo much with these now generation Diesels? Anyway, I also had that fan issue running at 100% when it's 15 degrees outside. I had it plugged in when I started it. Clearly in the manual it says to unplug it prior to starting. Something I've never done before. And no error message. Go to my destination, fan still running at 100%. 12 hours later it's back to normal. Back at home, plugged in for the evening. Next morning, I unplugged it first, then started it. No fan on, and continued to run normal. Second day same thing, unplugged first, fan ran normal. So just an opinion, it seems that the issue in this case, is only because of starting it prior to unplugging it. Starting it after unplugging it seems to work properly. Just putting this observation out there. Happy trails.