Now try and work out a way to get the hot air out. If it can't go anywhere, then it will just stall in the engine bay getting hotter and hotter.
Cheers
PD
Funny enough I was JUST then talking to dad about this. I plan to:
vent the wheel arch liner by cutting slots and bending them to stop crap hitting the radiator.
put some washers under the bonnet hinge to lift the rear of it up. and remove the rubber seal strip. Hopefully this will make a bit of a vacume at speed to suck the hot air from the top of the engine and cold air thru the front. think it will work?