1987 Dodge Ram Cause Truck Only Over Heat Heater On Always Run About Afourth

1987 DODGE RAM
189,000 MILES
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ANONYMOUS
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  • 1 POST
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

Mar 29, 2013 at 7:27 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,244 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.
Mar 29, 2013 at 7:31 PM
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