Thanks folks. Problem IS solved now. Turns out when I replaced one of the check valves ( vacuum pots) on firewall I had split end of one of the new hoses I put on. AC great now even under acceleration! Will run you out of car. Tha ks!

Topic NOT solved. Hit that button by accident.

1) I had looked under that volvo 960 post earlier and looked under my s90 for reservoir. No luck. I will look again. 2) thanks for the firewall diagram. That is where i assumed problem was originally. Replaced one of the check valves that i found was bad and a couple of the vacuum lines that appeare...

My 1998 Volvo S90 AC is cutting out under acceleration and/ or going uphill. Resumes afterwards. I found that one check valve on firewall was bad and replaced with a brand new OEM part. Also replaced several rubber vacuum connector lines on firewall around the two check valves that looked suspect. I...