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be sure the overflow is full.... if it is go to radiator and remove cap when cool check level then.... if full could be air in line or thermostat that is stuck from overheating caused from air in line...I would look at thermostat if full, good chance thats it !! have you ever checked coolant at radiator or had to add coolant? some times the overflowline can get a pin hole or small leak and will alow air into system instead of coolant!
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