The radiator fan runs continuously after engine is off.

The relay that powers the motor is stuck in the on position. Or the sensor that controls the relay is fubar. Till issue resolved simply disconnect the fan when ignition is off or hook up a manual on/off toggle switch.

Replace the relay for the fan. It should be under the hood in the fuse and relay box.

Hi Joe. For your information you never but never fill a radiator when the engine is hot and engine running. Must first have a cool engine open the radiator and if is only topping up coolant be first sure that the water is clean and fresh ( drain the old coolant first ) and after leaving a space for the coolant top up and always not overfill . Then you start the engine and let it run in idle with radiator cap off, turn also the heater on to hot air for helping the coolant to circulate. When you see that the temperature rise close the radiator and continue with engine on idle until the fan starts. Leave the car running till the fan cut out. Switch engine off,let it cool down - for dropping the pressure - and after you do open the radiator to check for any need for topping up coolant. As soon as you have completed just close the radiator.

Does the fan really run until the battery goes dead?? OR are you afraid that it might run until the battery is dead?? In many cars, the fan will continue to run for a short time after you shut it off.... until the engine coolant is cooled to a certain point. It can also run for a while when you've been using your air conditioner. Now, if it is actually running continuously and won't turn off, there is a sending unit somewhere that isn't functioning correctly, either in your cooling system... or your air conditioning system. You're going to need to do some research and find out which sending unit might be the culprit..... or take it to the shop. They'll know what to do and can probably quickly fix it.

Hi matthew,

The auxiliary fan for your car is known for internally shorting to power. The fan could run continuously until the battery is completely exhausted. I would recommend having it checked/ and or replaced soon. The fan is replaced as an assembly unfortunately.

There's a thermostat control switch that lets the fan run after engine shutdown to bring the coolant temp down to an acceptable level. If the fan continues to run, this switch has gone bad. Any major parts store, or a Lincoln dealer, can sell you a replacement switch and show you a diagram that will let you locate and replace the bad one.

Many cars have this feature. The fan will run for a few minutes at a time until the coolant in the radiator drops below a certain temperature. Most vehicles with this feature will have a warning label on the radiator shroud indicating that the fan may start without warning when the engine or radiator is still hot. The only time you would need to be concerned would be if the fan continues to run without turning itself off, and causing the battery to be drained.

Having the fan run on for a bit after the engine has stopped is not abnormal in itself, but 20 minutes sounds excessive.

If the fan does eventually shut off, I'd consider changing the thermoswitch (this is a sensor screwed into the radiator somewhere near the bottom, with a pair of wires connected to it - to change it, you'll need to drain the cooling system).

If the fan stays on continuously until the battery is completely flat, see what happens when you unplug the wires from the thermoswitch. If this stops the fan, you need to replace the thermoswitch. If it doesn't, then you need to examine the wiring associated with the switch and the fan, looking for damaged insulation.

A.

Replace the cooling fan engine temp sensor switch, this may be the cause.

It is not the fault: for long time Renault has that concept, that is to prevent engine oveheating when coolant circulation is suddenly stopped.

Radiator fan can continue to work up to 10 minutes after engine is off. You should worry about it only if it wouldn't stop even after 10 minutes.