[chartmaker]

Actual coolant temp according to the OBD-II reading. Temp is managed by the stat only for minimum. If air temp and ambient air flow due to speed then the stat modulates the coolant to the radiator so temp is quite steady. In hot weather you will run hotter based on the fan speed as managed by the PCM. So 200-220F is not uncommon. One of my recordings at 100F ambient, sun, mid July. Coolant never saw 200 at speed, and 222F when stop and go. All is well with that.
Stat only gets you up to minimum on cold start or cold weather. I see no issue with 190 in any of our cars.
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[chartmaker]

Back in the DAY, industry standard for emissions and mpg, required 192-4F stat and 14-16# pressure cap. Before pressure caps, 160 summer, 180 winter was standard. Of course back then the temp was only managed up to stat temp. Then it was up to ambient temp and speed/load. Stat only manages minimum temp.
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