This isn't an issue with airplanes. Honestly, we just don't have to worry about engines getting too hot in an airplane. I understand that the car guys have to worry about this, but because of how engines are mounted on planes they don't normally overheat. Heck, I'd bet that you would have a difficult time finding something to check it at 99% of the fields out there. I know that nobody at the fields I fly at has one!!! If you run the engine a little rich you'll never have to worry about it overheating.

Ken