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I think that aero drag definitely trumps weight -- see the aero motorcycle fairing on EM's home page.
That being said, the flow through the radiator can be ducted / improved in the front of the car. There are several threads here that reference the Hucho tome on this -- the best setup is an intake down low on the front (slightly below the stagnant point, I think?) and the exhaust up through a louver in the hood; which is located at a low pressure zone. And the whole thing is ducted, too.
The same principle can help with the air flow through the passenger compartment -- intake in a high pressure zone, and the exhaust out the back into the low pressure zone, behind the car. This both improves air flow through the car (with less drag) and it can pressurize the trailing pocket of air behind the car; which can actually lower overall drag.
See the original Insight and the Aptera for examples of this.
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