Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
I think Ktr made a come filter set up for the mk3's not sure if it's available though.
I dont see why it would bring a warning light up though, are you sure you havnt left anything disconnected?
If it's on the minimum mark it's hardly missing any, you could top it up with that stuff you've got, you could get some Renault coolant or you could just use a bit of water, it's not going to hurt it.