The air duct issue says: Low Freon
The sight glass says: Low Freon or other issues possibly like air in the system, or dirty condensor, or blocked metering device (that meters the freon into the evaporator)
As for low side psi, what RPM are you pulling those numbers from?
How long ago was the last service performed?
From what my buddy tells me, it's an expensive car. Evacuate it, refill it.