I have a 91 GMC Jimmy, 4.3 Liter SUV?

Jonathan C

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The temp indicater shows high temp in winter with the heater running, In warm weather the temp. Indicates as normal. the thermastat has been changed, as well as oxygen and other sensors. The radiator has been flushed and drained. Still It wants to run hot In cold weather. Anybody got any Ideas?
 


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