I broke out a fan on my Boxster last weekend the same way you did, and also wondered if others did the same. Seems like it's the only way to keep air circulating once the car has been shut down and sits, essentially baking, in the garage.
All of my other cars are front engine, and during the summer TX heat season, I have always backed them into the garage and popped the hood, which allows all of that heat to escape from the engine bay.
My next step for the Boxster may be a larger floor fan to circulate air under the car while a smaller one is aimed at the intake.
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