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Re: cowl vent
a pic of the underhood area and the grille area may help us help you.
is the rad sized big enough for the engine?
is the fan sized big enough for the rad?
does the fan have a good fitting shroud to allow the fan to move air properly?
is there adequate room to allow air flow past the grille and engine so the fan can do it's job of moving air?
does the truck sit really low so the air flow from the engine bay that is directed under the truck has a difficult time exiting?
if the engine is running within the normal temp zone and not overheating then the cooling system is doing it's job. you can insulate the hood and firewall if it is the hot sheet metal you are worried about. most newer vehicles have insulation in those areas for sound deadening and heat insulating. you can wrap the headers or exhaust system under the hood to help insulate the heat from those as well.
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