Coolant Warning

Hi,

I've got a small irritating problem with my M4 1.6 SE.

During the winter months, when you start the car you get a coolant warning. The temp of the coolant is fine as the car doesn't even have to start to get the warning (just turn the ignition!). The level is fine as well.

It never happens in the summer, so it is definately temp related.

Do you think it'sa faulty sensor?

Also, if I replace it, where is it located?

Thanks


James