If you cant see coolant in the filler neck fill it up.
![](./images/smilies/spacer.gif)
Check again a few days later and fill again if necessary, if it still drops you have a leak.
![](./images/smilies/spacer.gif)
Ideally the level should be right up there.
![](./images/smilies/spacer.gif)
Mine is always right up to the top of the filler neck.
![](./images/smilies/spacer.gif)
Check the jubilee clips are tight on all the hoses as this was where mine was leaking from.
![](./images/smilies/spacer.gif)