My Bonneville had the heavy duty radiator as std equipment with A/C. I still have the Super duty radiator from the Bonneville Brougham convertible 428 HO car I parted several years ago. Pretty rare. I know the aluminum rad's are more efficient but I am a sucker for original equipment.
I found the same thing driving my car around central VA in the summer. It would ping in the summer (very hot and very, very very humid) when pushed hard but if I waited until the sun went down and cooled things off a bit she really woke back up. Of course the best was in Nov to Jan. clean, cool, dense air.
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'69 Bonneville convertible
Warwick blue/ parchment interior
53 option accessories
2 more to go :-)
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