I bought a $50 can of refrigerant because the guy at Autozone said it would be easy to add. I'm thinking that was a mistake because I can't find the Low Pressure A/C port. Anyone know where it is on a 07 Volvo S60 and if this is something a novice can do??? thanks for any info.

 

forgot to detail the problem, my air conditioning works about 1 out of every 2 trips. Just blows warm air the other times.