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Temperature gauge showing car running hot but when you start driving gauge goes down to normal i already changed coolant temp sensor and had engine thermostat checked?
When you start moving you increase the air flow through the radiator and increase the amount of coolant being pumped by the water pump. Therefore the temperature goes down. You're going to need to figure out why the temp. goes up when stopped. Could be low coolant. Could be partially plugged radiator. Could be bad electric fan clutch. Could be many things.
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