1995 850 turbo....cannot recharge ac. I remember a picture posted a few years back of a second port in the turbos ?
Any help or suggestions would be appreciated.

There is only one fill port on Volvos. The dust cap has 6Nm printed on it.

Make sure the AC is switched on, both dials set to max cool, and the engine running.
If the pressure is close to zero, the compressor clutch may not be engaged even with the can attached to the line. You can force the clutch to engage by using a single wire and crossing the plug of the pressostat switch close to the firewall.

If the clutch is just not engaging, the gap could be too great for the electromagnet. That is a different problem.

Klaus

--
Common sense trumps a PhD