Absolutely.  Air comes into the engine bay and where can it go?  Forced down 
the sides of the engine and underneath the car or pushed down the propshaft 
tunnel (remove the gear stick rubber and go for a drive - it feels like a 
hairdryer vent.
You can have all the heatshielding in the world but gradually the air 
temperature under the bonnet will gradually get hotter and it is this ambient 
heat rather than transferred heat that causes the bigger problem.
RS
In a message dated 30/05/02 20:52:53 Greenwich Standard Time, 
macleans@earthlink.net writes:
> The aerodynamics of the car seems to create a high pressure area just below 
> the engine
> compartment keeping the air from effectively flowing out.  Just a thought.
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