What about a Lotus Elise-like hot air outlets in the hood?

[NeilBlanchard]

It lowers Cd by reducing the required intake size, and if the flow through the radiator is lower drag, then the contribution to the overall drag is also lowered. I think this scheme also lowers the drag outside the chassis by filling in a low(er) pressure zone and improving the attached flow.

[jamesqf]

Originally Posted by jimepting

Hucho points out that the approach is not appropriate for street cars because it dumps the engine compartment air at the same point as the cabin fresh air intake. I saw an Elise recently but didn't note how Lotus solved that problem. Their cabin vents must be somewhere else.

I believe they solved it by putting the engine compartmemt behind the driver.

[aerohead]

Originally Posted by Big time

Will they improve aerodynamics?
They have some cutouts in the hood to allow hot air from the radiators to exit.
Lotus Elise - Wikipedia, the free encyclopedia

Proper inlet and outlet ducting can render cooling system drag nearly zero,adding about 6% mpg.
My only reservation is,with a 'high-time' vehicle,hose can blow as well as upper radiator manifolds.(I've experienced both)
Should you be at speed,if the coolant makes it onto the windshield you could be blinded instantly with a very brief event horizon before you crash into something-somebody.