Jack, mine did the same thing on my 05 Ambassador. I was told by the installer that running hotter was a good thing as the 330 Cummins is most effiecient at around 190 degrees, if I remember right. Mine kicks in the high speed at 205 and cools down quickly. I changed the coolant to Final Charge Global (red) last summer. Very subjective on my part but it does not seem to kick on to the high speed as much as did with the regular coolant.
I don't have a bypass switch either but really can't see the need for one if the fan is working as designed.
Jim
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Jim,
2020 Ford F350 Platinum, 4X4, CCLB, SRW, diesel, 12,400 GVWR
2020 Jayco Pinnacle 32RLTS, Reese Goose Box
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