You have a block style valve. Make sure you get the right one. Picture point of reference is seen looking from the front of the car.
I don't know much about the saab and how the a/c lines are run, but you have another solenoid valve for the rear a/c. Does it blow cold back there? I'm not sure if the solenoid valve cuts off the air flow or refrigerant. Usually with dual air, you have two expansion valves, or an orifce tube in front and expansion in rear, or an auxillary valve. You do have an expansion valve in the front, no doubts about that.