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

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?....

I wish my shop had AC. I spend more time out there in the summer. Should have added it in when the shop went up.