Coolant expansion tank spray out coolant!!

[Jefftay71]

Hi...I got a Low coolant level warning and when I open the Bonnet I got a shock! Coolant was spraying out from the little nut besides the expansion tank Cap!

I top up again and turn on the engine and again coolant spray out !

what’s the problem. Where can I repair this tomorrow first thing?

my car is Bmw f30 1.6

help!!!

 

[rssid]

The nut is a bleed valve. Get a screwdriver gently tighten it a bit. Chances are you've overfilled the overflow or expansion reservoir if you look at it carefully you can see the min and max marks on the tank.