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Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be posting a reply ASAP
1- have you checked water pump ?
2- water thermostat ?
3- have you tried bleeding it ?'
4- have you been adding coolant to it ?
5- is the radiator clogged , would you say it over heats more at idle ?
Please let me know
ASE Certified Technician