Got stuck on the I-10 outside Tempe (gun shooting!!) for over an hour yesterday in 105F heat (first time this has happened) and my M103 was touching the red bar the whole time so I was pretty concerned. I had the heater blasting to try and keep her cool.

I did not hear the main engine fan spin up at all. Also, while I was driving (75mph) the car was still over 80C and hitting 85/90C on steep hills. I don't think it should be running that hot while driving 75MPH even if it was 95F ambient outside.

What could be the issue?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k