[mrh335]

My 2011 F10 535i engine fan started acting weird the other day. When the car is idling, stopped, in traffic, the engine fan continuously cycles to a very loud full speed and then slows and then immediately spools back up again. I am waiting for the engine to cool to double check coolant levels, but imagine there would be another warning. The engine oil temperature on the dash wasn't even showing up to full temperature. The current outside temperature is 50F and it does it day or night.

Any thoughts on cause or what to troubleshoot?