[bobcowan]

As I understand your question, you're thinking of an engine mounted fan not to pull air through the radiator, but to move air through the engine bay. That's an interesting thought.

As you move the air from the front of the engine to the rear, a little would go out of side vents, and the rest would go out under the car. In slow moving traffic, it might actually help. I'v never heard of anyone trying it, so it just might be worth a try.

Before doing that, I would optimize what you already have:
- Put a shroud around your fan so you're using all of the radiator, and not just some of it.
- maybe install a bigger 2 speed fan.
- Use a surfactant like Water Wetter or Purple Ice
- Make sure your timing and fuel mixture are correct.
- remove any underdrive pulleys