I can't remember if the fans come on at 221°, and the fans go back off at 211° F. Burns will probably know. I had a fault in my gauge once, but busted out my thermocouple, and put her to the test. Bam, got it fixed. Just for a heads up, on these "BWD" brand stuff from Advance, Auto zone, and O'Reillys Auto parts, the gauge will sometimes read differently, and when I mean differently, I mean on the dash where it used to run correctly before, it now looks like its running hotter. That's not the case, unless its actually running hotter. You will just have to get used to it, or buy Motorcraft parts. In my personal experience, I thought my car was running heller hot, but that wasn't the case, a thermocouple proved otherwise. It's just that the temp gauge sensor now has more of an operating room range. I run a 180°F in dead of summer, and change her back to a 192°F in late November. I don't think my fans have kicked on but maybe 3 times this whole summer, but its getting hotter.