I just replaced my thermostat, cause it was stuck
closed and now I can't tell it its the radiator or
water pump, still runs hot haven't driven it but
sitting in park and revin it up will make run hot
after bout twenty thirty mins doin that, any help.
If your overheating at idle, it can be many things. You already replaced the thermostat, but low fluid level/air in the system, water pump impeller, radiator cap, fan not coming on, or failed head gasket could be the issue.
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