WHAT CAUSE MY TRUCK TO ONLY OVER HEAT WHEN ...

  • Tiny
  • Anonymous
  • 1987 Dodge Ram
  • 189,000 miles

What cause my truck to only over heat when heater is not on
it always run about afourth of the wait when I turn off the heat now it runs three fourth almost in the red I turn heat on it goes to just half
its a slant 6 cylonder im not losing antifreeze and its not in the oil

Saturday, March 30th, 2013 AT 2:27 AM

1 Answer

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

The heater core produces heat but also is functioning as a small radiator. That is helping to cool the engine. Based on your description, it sounds like you have a plugged radiator or there isn't enough coolant circulating. Try to flush the radiator and engine block to see if that helps.

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Saturday, March 30th, 2013 AT 2:31 AM

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