Percolation? Heat soak? Don't drive during summer??

And you've done quite a bit to your cooling system, no? Is it going to hit 103F today in your town the way Vegas will? How about humidity? ;)

I mean, apples and oranges amiright?

Like I said, a cooling system CAN be made to work anywhere/everywhere. But running in an enclosed space is a tough task which takes proper design to overcome. Stock-like cooling capacity is not going to overcome that challenge, especially with a crank driven fan.
Damn disagreed again LOL no I haven't done quite a bit to my cooling system. I guess an electric fan if that's exotic to you. No shroud.. a Factory water pump and a cheap Summit 2 row aluminum radiator. Probably cost $160... I don't have $400 into my entire cooling system including the hoses... That's pump hoses thermostat fan and radiator... I'm not one of those falutin three-car garage kind of guys... LOL...