It isn't a problem. Electric radiator fans sense the temperature of coolant and if it is above a certain threshold the fan will stay on until the temperature drops down, even if the engine is off. It's normal. Don't try to fix something that isn't broken.
Ingeneral, the fan will run only if the temperature of the radiator is above the normal range. If the fan is running, then the radiator must be over temp unless the radiator fan thermostat or it's relay is defective. If the radiator truly is over temp then you have a larger over-heating problem You state the thermostat was replaced. if you replaced the fan thermostat then either the radiator really is over temp and it is doing what it should, or there is a problem with the thermostat-fan relay or switch. If you replaced the engine thermostat that controls the flow of coolent between the engine and the radiator, then that probably wasn't your problem and you should look elsewhere for an overheating cause. I would start by determining if the engine actually is overheating or not. If it is, I would look for coolent system problems like the engine thermostat (if you didn't replace it already), water pump, leaks, scale build up in the radiator, or blockages in the system. If the engine isn't overheating then I would consentrate on the fan, fan thermostat and relays.
Should be located in a removable housing at the engine end of the upper radiator hose Drain about 1 gallon of coolant from the radiator Remove this housing Note how thermostat is installed Clean both surfaces Replace thermostat and gasket Re-fill coolant slowly to prevent an airlock Start engine and look for leaks Run engine to normal operating temperature with heater on Re-check coolant level In my 1999 Nissan Altima the thermostat is located on the lower hose under a housing as described above. this is very unusual place but that is were mine is located.
Drain about 1 gallon of coolant from radiatorRemove housing at the engine end of the upper radiator hoseNote how thermostat is installedClean surfacesReplace thermostat and gasketRe-fill coolant slowly to prevent an air lockStart engine and look for leaksRun engine to normal operating temperature with heater onRe-check coolant level
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