help i checked my water and their was none just a thick thick rusty coloured foam in their only at the bottom of bottle does anyone have any idea whats up

Yes, you have a coolant leak.

As to the sludge, have you topped it up recently? If you use the wrong coolant it turns to a horrible sludge.

You need to drain what's left, flush it out thoroughly, find the leak, and fix it, then refill with the correct coolant.

Personally, I'd drain it, flush it, fill with water only, use that to locate the leak, then flush is several times.

:iagree: - When the leak is fixed, refil with VAG G12+. Accept no substitutes!