[BenI]

The engine grill is designed to let cool air in. Once air enters the engine compartment, it is sucked into the impellar and driven through the fan housing and down around the jugs and heads. This air, now having absorbed some of the heat from the engine, is fed out underneath the car. I can feel it coming out the sides of the car when idling. Thats the basic design, and the illustrates the need for the extremely annoying at times sheet metal to be sealed at all seams. once you start having leaks, the air cooling is less efficient. I hope this helps.