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The heaters centainly not cold sorry gents and just a few weeks ago cleaned the external heater core only too. Just know in my Chev that switching from 75C to 88C made the heater insanely nice jumping back in the cab from say icy paddock work.
It is my belief too that old diesel donks seem to prefer running hotter than 76.5C coasting along at best I’m experiencing this winter.
Our 8.3 work Cummins sits all day on 85C and so too I believe our Louisville tipper.