When I first start my car, my A/C is slow in cooling down; it gets cool after a minute or so, but it takes a good 5-10 minutes before it gets 'cold' (I know, I should measure the outlet temp.... a chore for tomorrow maybe). Around town, the A/C is cool but not cold. But on the highway everything is fine usually. I thought that the system may be low on R134a and so I checked the low-side pressure. It read a steady 35 psi and the compressor ran without cutting out. My question, what has experience shown as the 'best' operating pressure for our volvo's A/C system?

Thanks,

JR