Morning guys I have a 1996 Legacy GTB in manual i got for a project car, got it running nicely now I took it for a drive the other day and when I got back home I checked the overflow tank and it had filled it up but the engine hadn't overheated at all, but after sitting on the drive idling for a few mins the temp started to rise not into the red or anything, so I took it out again for a short drive and the temp comes back to normal
Would this indicate a sticky thermostat? the car had been sitting for months before I purchased it