hi all....new to this site..can anyone help.. i have a c3 picasso diesel...have just had it serviced...garage said i needed a coolant change.. :rolleyes: ..had car back and a few days later the warning message came on sayiing over heating and stop car..so i did..few minutes later started car and was ok so drove to garage who did service and they said it was a faulty sensor switch.. <_< ..have got a new one now but cant see where it is on engine...any replies most welcome.... :wub: