2008 Ford Explorer
With my 2002 Tahoe needing a new head, we are using my wifes 2008 4.6 L Explorer. It's not quite as comfortable to sit in, but it's handling the trip well so far. I did have to replace the radiator (common problem) before we left.
Coolant temperatures tended to rise to 105 °C on grades. Even though temperatures could go safely above that, we turned the AC off, heat on and windows open. That usually brought the temperatures right down.
The transmission temperature got up to 219 F on the steepest grade leaving Oregon. Transmission flives [fluid?] takes a long time to cool. I'm pretty sure the Explorer has a separate transmission cooler. other than that, the temperature stayed between 185-200 F.
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