Oooh doesn't sound too good. But it was ok when you had the coolant changed, how long ago was that? I don't know where the stat is on the 08 model, but the previous is a swine to get at, I have heard! So the super method is to fit a Renault 4 one in the coolant hose to the rad. See Andy Browns video link on this forum somewhere for the job he did on his. I'm a bit confused what he means by "nowhere to put the temp sensor" as the stat fits in a housing so a little lost why there could be a problem. If yours came in a housing, why not just use the stat from it? It may not be possible of course. And he put the old "sludged" coolant back in?????? WHAT? However, usually there will also be milky white cack in the oil if the head gasket goes, oil goes into the coolant also coolant gets into the oil. Visible through the oil filler or possibly on the dip stick. @@andyb2000 and @@QinteQ I believe you guys are up that neck of the woods?