On 28/01/2019 13:13, DerbyBorn wrote:

I topped up daughter's Fiat 500 with some antifreeze (a few weeks ago the
level was lot - and I tipped up with water so I was keen to get some
concentrate in) I ended up brimming it.
Will it matter? Does it need some air space? Should I syphon some out to
bring it down to the max mark? Or will it sort itself out?


The water will expand, but the tank must have an overflow. Even a Fiat!