thermostat, for all of you in colder climantes Options

[saleeka]

ok since i got my celi in august, have have no idea as to what is typical for a celica when its 15 degrees outside. I was wondering about my thermostat. all through summer the needle would almost, but never go to the halfway point. now all of a sudden it will go up to just below summers point if im doing a lot of shifting, but if im on the highway my needle drops down to about 2/3 of the way to the halfway mark... to me this makes no sense, especially since it is a rapid change (you can watch it happen easily) and its when the engine is at a constatnt 3200 rpms or so...and to make things even more unusual, when i slow down again the needle climbs right back to where it was... watching my thermostat like this is making me nervous- when its above 30 it has done no such thing... anybody know what gives?