[Cunningr]

Hi,
I am experiencing a strange issue with my 00 S. Twice after arriving home I have had coolant over flowing. Car temps are 80-90, seems to happen after using the AC and ambient temp of around 39-48c I live in Southern Spain. I did notice that the over flow tank when cool is over the full mark a tad. The coolant it looses is about a half a cup or so.

I think it may be just loosing fluid because of expansion, otherwise no leaks anywhere else noticeable.

Any thoughts?