1997 Legacy GT AC got progressively worse and then stopped altogether, would cool when engine was revved but not at idle, and now not at all. Got a can of refrigerant with a gauge on it, hooked it up to the low side, and to my surprise, showed pressure up in the red zone. I really thought it was low refrigerant, especially after seeing bubbling at the valve after I took the cap off.
Any ideas on the likely cause of this? Sounds like some sort of blockage but I don't know where to look. Will probably take it to shop but would like to know what to expect so I don't get taken for a ride.
Thanks in advance.