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The first thing to try is the check valve as they are very easily changed. If the system changes quickly on acceleration you probably have a bellows or other leak. If it changes slowly on acceleration, my first guess is the check valve.
If the air just stops coming from the dash vents it is probably the dual acting bellows in the center. If the recirculated air function is involved, the problem will only happen when the system is in recirculate mode.
I haven't gone back into my car again. I'm waiting for some check valves and fasteners for the bellows. Dealer had to call Volvo to get part numbers.
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'96 965, 16' wheels, Michelin Pilot Sports, rear 18mm bar + Koni, 204HP cams, 126K. Put 200K on '85 745 TD.
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