Coolant - Don't know what's in my Boxster

[kk2002s]

Use distilled water for now. Don't take a chance and mix
I was in the same predicament as well. Mine also had greenish coolant and was afraid to mix. I just topped of with distilled water until I did a flush and refill with Porsche Pink
I believe that Porsche changed their life long coolant from green to pink somewhere in the mid 2000s

[rexcramer]

+1 on the distilled water for now. I would also like to suggest that you pull up the carpet in the trunk and check around for moisture.