It was 104 here yesterday and my unit ran for almost eight hours non-stop with no problems. I always open all the doors, front drivers and passenger doors too, and have sometimes put a fan on the motor when I think about it, but didn't yesterday and had no problems.
I HAVE had a few gasket issues with this latest TM that I think may be a direct result of running what really should be an out door motor inside a van. Had two valve cover gaskets blow and just last week I had the shaft seal come out on me. Got a fine spray of motor oil all over the inside of my spanking clean van.
Pisses me off ...