Why is my radiator fan staying on constantly until i turn off the car.

Hi Sian, I'm AL the owner of Big As Auto Repair in St Charles Mo

I look forward to helping you.

Sian, your engine is overheating and this is a crucial issue. This problem can damage you engine do not let it run very long until you find out the problem. First: VERY IMPORTANT for your safety, wait until the engine cools completely at least an hour, then take off the radiator cap, if you only have a recovery bottle make sure there is coolant in the radiator or recovery bottle. If there's no coolant top off the coolant and see if it overheats again. If it is full of coolant you can try changing the thermostat and see if that stops the overheating. To answer your question the fan is running all the time because of the overheating issue, its trying to cool down the engine. Hopefully it has not overheated enough to warp the heads or damage the engine. Let me know what you find and for further help click here: Auto Repair