Yep ... what he ^^^ said. Even with the shroud tightly sealed to the radiator ... at a stand still, without the baffles, the fan will draw air through the radiator fine ... but the closest supply of air to the front of the radiator will be the gaps that lead right back to the engine compartment. Fan creates a low pressure area between the front of the radiator and the bumper/grill ... so it will suck air through any gap in the core support, around the radiator tanks, bottom of radiator, frame horn holes. We always picture air just coming in through the grill ... but it will suck the air from the closest source ... which is the core support gaps.
Picture a bathroom wall vent tightly sealed to the wall ... but with big holes drilled in the wall right next to it ... it will just recirc air through those holes rather than actually pulling the air out of the room.
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