as i said, there`s a little plastic kind of key, on the top left of the rad, so thats driver side when you have the bonnet open, its only a teeny tiny trickle, i gave it a little turn, wiped it clean, and will check it again tomorrow,

but what exactly is this little turnkey thing?

any help would be great lads

It,s for bleeding the cooling system of air, if you turned it to tighten it should be fine, but as you said keep an eye on it, check it after a run also.

bleeding the ais system, i worked as an apprentice truck mechanic many moons ago, i always remember the problem this would cause, and the problems trying to bleed it

why would it start leaking though?