either two things, thermostat or waterpump, open the hood and see if there is any grey crap around the cooling system components, (looking for baked on antifreeze) if you do find it , you might have a cracked thermostat housing or waterpump, if not then i think your thermostat is stuck slightly closed. that would explain why your car is overheating while at idle, not enough coolant getting to the engine. when mine went it was the opposite, stuck full open, so the car ran cold all the time, when at idle the temp would drop below 1/4 and when running it would reach up towards just past 1/4
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