Checking accuracy of engine temp gauge.

[The Real Maverick]

I always thought that ICE engines should run at 212F or over to evaporate any moisture that has accumulated in a cold engine?

This truck (and most vehicles on the road) run with coolant temperature between 180°F and 190°F.

On a 100°F day it might hit 195 if you are going uphill unloaded. I've seen 215°F MAX and for a very brief interval while towing 3,000 lbs up 6% on a 99°F day. Most of that day it was 195 to 205.

I'm convinced the engine will not overheat in the hybrid. It just won't with proper coolant level.

Think about it. It's using 25% less gas than the Ecoboost, and naturally, makes 25% less heat while doing so.

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[dochawk]

A practical example is the steam you see when running hot tap water (not boiling, hopefully).

For any given liquid, there is a temperature and pressure chart divided into three regions, showing which two states of liquid, solid, and gas it will be in. At the intersection of the there lines, is the "triple point" at which all three exist in equilibrium.

so we're used to water at temps where it's liquid and vapor, but once you freeze it (at atmospheric pressure) it's solid and gas. There is also a known equilibrium for the vapor pressure.

boiling water is at the boundary where it can exist in both gas and liquid. As the pressure declines (with altitude), the temp at which this happens goes down.

When you see boiling water at sea level, it is 212; adding heat makes it boil harder, releasing more gas, but cannot increase the temperature.

IIRC, the triple point for water is at .01C at a small fraction of atmospheric pressure. As I was wondering why I was typing all of this, it's because your post caused me to flash back to high school physics, and Fr. Capitulo placing a little chamber on the overhead and applying a vacuum pump to bring a bit of water to that temp. You really have bits of ice floating in boiling water!