Had both problems on my 97 V90 but its been several years. Vacume bleeding off under the dash combined with lower vacume from the manifold when accelerating was the cause of the misdirected air. My solution was to pinch with an alligator clip and shut off one of the vacume lines from the vacume distributor to a servo, cannot remember which one. This made an insignificant change to its functionality. Have read of someone fixing by plugging a line to a servo with a golf tee but never understood how that would work as that would create a huge vacume leak with the open line to the solnoid.
I think the compressor cut out is another problem, seem to remember there were 2 switches at the compressor in series with power to the clutch. Bypassed them both.
--
David Hunter