[Frank Catt]

Absolutely right Howard, but remember that the air going through the radiator can get stalled at very high speed particularly if there is a mesh screen in the opening. Having never had a rock or foriegn objects damage a rad or condenser we never use any form of screen, but you are again very right about the need to seal the opening so that all the air goes through the radiator, not only for cooling but also for aerodynamics.