6.2 Diesel cold weather over heating problem

Discussion in 'GM Diesel & DuraMax' started by Mike Hill, Dec 5, 2012.

  1. Mike Hill

    Mike Hill Rockstar


    Recently my Suburban 6.2 Diesel has begun to over heat in cold weather.

    When I start it up,the temp remains low,untill it quickly rises to danger hot.All the while my Heater will not blow Hot air.Then I pull over to cool it down,then afterwards the motor runs at normal temps

    I have changed the Thermostat,drained flushed and refilled the Radiator with an antifreeze mix,there is visible water flow across the Radiator

    I had a theory that perhaps some gunk had frozen in the Cooling system,thus forming a obstruction which caused the Engine temp to rise,after stopping the Motor the plug would melt and normal cooling would resume.

    This was however not the case.

    Thankyou in advance.

  2. Mike Hill

    Mike Hill Rockstar


    This problem just stopped happening,very odd indeed.
  3. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    Mike you think you might have gotten an air bubble in the heater core?
  4. kinson33

    kinson33 Member 1 Year 100 Posts

    My 6.2 Blazer did something similar. Temp would spike, coolant would actually leak though. Did the same work you did but didn't replace the pump and I'm thinking it might have needed that. Sold it before I figured it out though, some lucky mechanic who worked on them in the NAVY is now fixing it up.

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