Mine used to do that.....it was the radiator, but I knew it was the radiator because the fins were all mashed up and the previous owner had about half of the core blocked to keep it from leaking.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option
00 Dodge 2500 4x4, 24V cummins, 5 speed
Chad
South Central Nebraska
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