Originally Posted by antonye
It may be that the coolant expansion tank has split along the plastic seam - a very common problem on the 916 line!
Checked that this weekend and all good.
I went on a 20 mile slow ride and noted thumb nail full of coolant pool at the bottom of the cylinder
So cleanded and let her tick over for a while, fan came on three times nothing
Went out for a 40 mile blast on Sunday, nothing
Will keep an eye, dont know if its slowly sorting itself or not!