Warlock. A/C on 964 is not so much different from any other car.
16, 160 that you are getting - 16 is low, should be 30-40 range.
Do you get any cold? Also, you indicated that pressure was low initially - most probably you have leak. It is good idea to find out where it leaks.
Bad evap valve usually blocks low compression side. Here's reading with bad evap valve and full charge:
Here's after replacing valve:
PS. It maybe me, but I removed (and weighted
) all A/C components from my 964.
.
Oleg.