George B
¯\_(ツ)_/¯
Did your heater core return hose go to the radiator? If so it's no wonder. When routed like that it bypassed the thermostat. Had a radiator on Ol' Butterscotch that was plumbed that way and it was a cold pig in the winter. Moved it to the port on the water pump and she worked great down to -20 without covering the grill.Not on my '07 but on my older 89/91 Burbs it was a necessity. For the '91 I actually got some plexiglass from Home Depot and made a shield that screwed onto the grille instead of using carboard and bungee cords.
GOD I MISS MY OLD GIRLS...
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