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depending on the engine temperature the fan is supposed to remain on after you turn the engine off, until the engine reaches a preset cooler temperature. when it reaches cooler temperature usually within 5 minutes or so it should cut off... if you cut it off and it is running 30 minutes later.. then there is a problem with the fan relay or temperature sending unit.
Find and remove the cooling fan relay and and replace it with a another relay. If the fan stops working while the vehicle is off replace the relay. It it possible that the relay stayed latched on allowing it to work even though the vehicle is off.
on a lot of vehicles, the electric fan cooling the radiator will stay on when the car is turned off. this is normal and happens when the senser tells the fan that the engine is hot and needs cooling. if it stays on for prolonged periods, there is a problem somewhere. should cool and turn off automatically. R
Is the system low on coolant for some reason? this would be the reason if it is. If you did any service to the cooling system did you bleed the air out of it as required?
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