Coolant Draining

[TomMan7531]

Hi,

So I was in a McDonalds drive through and my 635 overheated... It was a known issue that on idle or in slow traffic it got warm but full steam was coming out!!

After several stops to cool down I got home and the next day it seemed to have boiled the whole lot, went out and bought more, filled the tank and in a couple of minutes the whole tank was empty again, it somehow had sunk into the engine, all while nothing was on. Went for a quick spin and quickly it went from cold to hot so stopped again, the coolant started coming back into the tank in a gulping way, eventually the coolant light went out but then all of a sudden it was all swallowed by the engine again and none is in the tank.

No idea whats happening, please help :)