One of the things that could be done to help with the heat issues and air build up under the hood would be to some how vent the engine compartment. One of the things I have done on some of my cars is to remove the weather stripping between the hood and the firewall. It's not a big gap, but some cars you can space the hood up in the rear to let the air out. Ever noticed the hood on the old Ford GT 40? Trans Am's had a vent in the front fender between the inner fender and the firewall to vent the engine compartment. All the air that goes thru the radiator is vented out over the top of the hood. I haven't done it on this car because of the oil smell from minor oil leaks and seepage. Those fumes go straight into the air intake for HVAC (low pressure area at the base of the windshield) if it is switched to flow thru ventilation. I could keep that closed, but sometimes I like to use the outside air pressure to bring in cool air depending on the seasons. I have some other places I may add vents too.
You could add some louvers to the rear area of the hood too. Just my thoughts on this Idea.
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