Unless there is somewhere for the air to go, upping the pressure from the fan won't do much good. It sounds to me that the engine compartment is pretty well sealed (not totally or the engine would overheat all the time).
Where does the air vent from the engine compartment? I just made a look around the engine compartment and underneath and didn't see any vents. They've got to be there somewhere. It might help to enlarge them.
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