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5,418 Posts
the only things i can think of are:
your heater core is still partially blocked (common),
the seals on the blend door have desintergrated or come unstuck, i have never seen these seals but someone once said there's had turned into a sticky mush of sponge,
have you checked the heater air inlet for a partial blockage, and the cabin air filters if you have them ?
if you are keeping the Nitro then yep i would replace what you can for piece of mind,
41 - 41 of 41 Posts