F56 Cooling Fan and Coolant Boiling Issue

[Reaper_Shotgun]

I’ve run into an issue with my 2018 F56 Cooper S that’s left me scratching my head. Since I got it two months ago, I’ve had to add about 2 liters of coolant, and recently I noticed the coolant boiling after a drive. There’s also hissing from the coolant cap, but the engine fan wasn’t running until I turned the ignition back on. When it did start, it seemed to run at a low speed.

Is the fan supposed to have a high-speed mode? And should it keep running after the ignition is off, like my old R56 used to do?

 

[ZenTrekker]

Fan speed is controlled by the coolant temperature. What does your gauge show? Losing 2 liters of coolant in just two months is excessive, so something’s definitely off.

I recommend taking it to a shop to have it inspected, especially the coolant cap

 

[Mini King]

Yeah it sounds like something’s off with your cooling system. The fan should have a high-speed mode and keep running for a bit after you turn off the engine.

 

[PhoenixPulse]

You should probably take a peek at your radiator cap. The seal might be damaged, and that could be the reason why.