I am a clio 200 owner (had it three weeks from new). The temp gauge moves to third line (first being where it sits when cold) when engine up to temp but when on the move the gauge is constantly dropping to middle of second and third line and then back up to third line....It never stays still. It does this all the time even at constant speed on motorway. When stationary ( no airflow) it stays at third line and is rock steady. Just been checked by Renault (they said they have reset the dash....ehh?) but still doing it. Any 200 owners out there have same thing and its a normal thing. Owned lots of other cars and never seen this.