I own a 2015 Toyota 86 Gts Auto, I brought it second hand with 12,000 kms from a Toyota dealer in Sydney which was owned by Toyota themselves with full service history. The car now has 15,000 kms. On a 22 degree and above day with a/c on when I pull up I have a strong coolant smell evident. It never uses water, ive never had to top it up. Its has also never got hot, the guage sits just below half. Ive had Toyota check it out, to which, surprise surprise, there is no leak at the time. The overflow bottle when cold was on the full mark and then obviously rose with the expanding hot water. I read on the bonnet that the level should be between low and full, cold and warm, which I have done by reducing the level. I removed the seal at the rear of the bonnet thinking it would allow for better airflow in the engine bay. All this seemed to have worked for a few weeks but now it seems to have come back slightlty.
Has anyone else had this issue and resolved it. I was thinking it could be a thermostat not behaving properly or a coolant water mix over a 50/50 mix.
Or is this just the way the car is? Any suggestions would be greatly appreciated.