Read on the AC display I have 78C which is 172 F on the highway. This is the same temp as seen with a Durametric tool.
In stop and go traffic it shows up to 100C ( 212F)
This is with a low temp thermostat.
Until MY 2000 (at least) it is possible to use the AC hack to get some of the OBD info
Boxster AC Hack - 986 Series (Boxster, Boxster S) - RennTech.org Forums