Nothing wrong I'd say. The coolant doesn't start to boil until over 100C because of the pressurisation in the system.

I'd suggest changing down when the temp goes up and let the cooling system deal with it. I presume you've kept it in good condition?

I had an elderly relative who'd insist on turning the heating on full if the temp gauge went any where near halfway mark. They could never be convinced the design of it catered for such eventualities.

Edited by bathtub tom on 15/08/2011 at 00:51

I have been experiencing this same problem with my 406 of late. It used to be fine. I have changed the 3 relays at the front, the pressure cap and the coolant to no avail. Have you found a cure . I do not go with the idea that it is not a problem, and just change gears to sort it like someone suggested. Haynes is of no use, as the colour coding is different, and the fuses it mentions do not exist. "Frustrated.