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over heating@idle

Discussion in 'The Garage' started by ARTIC, Dec 16, 2004.

  1. ARTIC

    ARTIC Registered Member

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    i have a 1986 6.2 GM diesel,i just replaced the thermostat,and the water pump a while back,when you shut it off,and its hot it slowly boils back in to the overflow tank,flow in rad is good,i checked when it was cold.not sure what to make of this,a head gasket or a rad flush,soon as you bring the rpm up to 1500 the temp is fine,and then ok for a while,10 min @ idle and shes over 200,just wondering whats up with that,thanks
     
  2. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    This is going to sound weird but..... have you got a viscous (clutch) fan? We've seen a couple of oddball cases recently were the clutch fan was engaged all the time and at idle was was cooling the rad so much that it caused a vapour lock between the very hot engine and much cooler (relatively) rad.
    Either way it sounds like a circulation problem. Hoses OK?
     
  3. four_by_ken

    four_by_ken 1/2 ton status

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    Simple and easy thing that has to be asked first... have you checked the radiator for anything blocking it.... mud?
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Fix your fan.
     
  5. four_by_ken

    four_by_ken 1/2 ton status

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    You have such a way with words.
     

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