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

1987 DODGE RAM
189,000 MILES
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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 30, 2013 at 2:27 AM
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