will a bad heatercore cause jeep to run hot
a plugged heater core would give you no heat in the cabin so , no , I don't think so , start with a new thermostat , coolant flush , take a look under the oil fill cap and let us know what you see .
No. Why do you think the heater core is bad? No heat inside? I would flush the system and make sure the coolant is full and then purge all the air out of the system.
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