Ok. so I have a 01 S-Type 3.0 and the temp. gauge has always been at the straight up level at operation.Yesterday I noticed that the gauge would drop a little then back to normal then to all the way down like the car is off then up again never going above normal. The car is running the exact same so I am thinking its a gauge issue.
Has anyone had a similar issue if so what was the problem. Any thoughts or experiences would be greatly appreciated.

Thanks...Gary