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

Phreakish said

A fan that's recycling hot air from a garage isn't going to cool the radiator as well as a fan moving cool outside air that's cooler.
Pretty obvious..

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For argument's sake what if it isn't cool air outside and it's one of those 117 degree Arizona days and it's 117 degree being sucked in to the radiator with the fan and the inside of the garage is actually 75° from the air conditioner in the house?....