Is this the relevant text from the faq?

"In a 960, you can pop off the panels on either side and put a clamp on the recirculating bellows (orange hose)and drive the car and see if the problem is gone or put a clamp on the floor side of the bellows (Yellow hose IIRC), or both (as in our case), and see if it goes away. If it does, the respective solenoid is at fault. The vacuum reservoir located behind the glovebox may also have a leak (common problem on this model). Unfortunately, in their infinite wisdom, Volvo opted to make the canister part of the evaporator case (VERY expensive). I replaced mine with a separate and independent canister. Any good A/C shop can do this. You can also just permanently cap off the offending vacuum line (probably orange or yellow), although you will lose some functionality. Remove the glovebox to locate the vacuum junction box with the lines installed."

If so it sounds like I need to
1). Remove the dash panels on both the drivers and passenger side of the climate control system and look for an orange hose. Clamp it off.

And/or

2). Remove the glovebox and that will allow me to clamp off the orange line. See if it makes a difference. If not I can then clamp off the yellow line?

The second option sounds easier.

Also, when you write "I also took of the cover on the fresh air so i could get inside and i stuck a piece of wood in there to hold the flap closed permanently so it would not allow outside air in."

....is the cover on the fresh air at on the engine side of the firewall where the cabin filters are hidden away at? Or are you talking about inside the car under the dash?

Thanks very much,
Jim Lee