This 1988 760t has been plagued for a few years with the "no air on boost" senario. But now, on a warm day, after driving for a little while, air stops coming out the louvers and there is no response when turning the selector that directs the air to heat or defrost. This is new. I have read the FAQs on this topic and am not sure I can pull the unit out to look for bad solder joints. I will try to look at the vacume motors. I want to know... can I manually apply vacume to the various motors if the CCU is unfixable? I few aquarium valves, some tubing, and I should be able to make a mini-manifold and connect to vacume and the motors I want to actuate. I don't know though, if I can even find the bellows/motors. My car has 271,000 miles, original tranny, headliner sagging badly, and with the way gas prices are going... I just want to keep this running a bit longer until I can find a car that gets over 30mpg. Has anyone done what I am thinking here? to manually control the vacume motors? Thanks, Glenn