ok yes while the grill block does yeild higher mpg the whole point of a radiator is to cool the cars coolant.. since yours is 90% blocked its not cooling worth a crap. moving coolant usually doesnt boil unless its in the red zone for a little bit(5 min or sometimes less) and if it gets up there your prolly screwed and already warped the head, and causing some major damage to your engine.
no a higher psi radiator cap isnt goign to help if anythign its gonna make it worse. its designed to relieve pressure so it doesnt blow a hose or the head gasket.
do you live in higher elevations? if you do its automatically more likely to boil over. you may need to adust your coolant to water mix if you do.(more coolant)
and how do you mix your coolant? do you buy the concentrate and then mix it 50/50 in 2 bottles?
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