Hey how we all doing? First time on here so hope i posted in the right place? I have a wrx sti wagon 1998 have looked after this car for a few years now and has done me really well. Just yesterday i noticed that my temp wasn't going up much over the line at all after i had been driving around at least an hour. I have been told that it could be a thermostat problem? If so is there much work involved as i need my car for my job? And also where you put your coolant after a few days that green goes brown not sure why this is can anyone tell me please??