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.

Good God man. The second my car won't idle in a garage without overheating is the day I get into something outlandish, maybe something like snowmobiling ?