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Check the coolant level. The 3400 engine is know to have head gasket problems. It starts out as low coolant and progress to the fluctuating temperature condition.engine coolant level is good,and no outward leaking problems,...could I possibly have a bad thermostat?cHECK TO SEE IF THE ELECTRIC FAN AT THE RADIATOR IS RUNNING

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12y ago
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Q: 00 mont starts to overheat at idlebut not if heaters are on runs 165 drivingany answers?
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