Doesn't make sense Damien, it's not fine. Change the stat and have it rock steady at 90. Too cold means extra fuel consumption and extra wea r and the heater not working too well.Bah, mine does that all time. It's fine, rather have my engine run cold that massively hot.
Sounds to me Damien like you have a few probs there.All standard guages in cars are useless they don't stay at 90 degrees at all. Mine drops to 80 when cruising and prefer it than having it at 90 or above that is according to the guage which may aswell not be there. When you are stuck in traffic temps sky rocket, you have massive heat soak which I think is one of the problems with the jerky take off you get in traffic.