A lot of automatically controlled climate control systems on cars since about 1967 use "vacuum motors" to operate the dampers in the air boxes. These are usually just a bellows and light return spring that are controlled by the presence or absence of a vacuum.
I removed the airbox unit and replaced these actuators in my parent's 1972 Cadillac around 1990. It was a very successful result; however, I had to virtually dismantle and reassemble the entire Cadillac dash over 3 days to replace these "vacuum motor" components. I think they put this airbox sub-assembly on the line first and build the car around it.
I did a similar task in 1979 when I installed factory AC into the dash of my parents 1975 GMC Motor Home. I used a car AC compressor, dryer, muffler, expansion valve, condensors, and a new GMC airbox with vacuum motors, heater core, and evaporator installed. This also required a large amount of dismantling and reassembling. this also required finding a set of OEM accessory brackets that would permit mounting all the accessories including the compressor onto the 455 Olds engine without interference. The whole job took me 2 weeks of my summer break from college before I started my summer job. My dad then added the refrigeration oil and charged the 4.0# Freon 12 system. It worked very well, even visiting in the 107+ degree heat of Oklahoma, Kansas, and New Mexico.
These "vcuum motor" actuators are not unique to GM, because I had a similar issue with my 1987 Ford Taurus SW. I never got to dismantling the dash and replacing the defective components; so, this car had the heat and AC come out at the floor (no defroster action, and poor AC circulation through the car.). I knew how to pick my way through that repair, but never got the 2-3 days dedicated to that fix from when it broke in 1995 prior to selling it in 1998.
A middle school team from Rochester, Mich., has again nabbed the grand prize in the annual international Future City Competition, which drew students from 37 regions of the United States, as well as from England and China.
The word “smart” is becoming the dumbest word around. It has been applied to almost every device and system in our homes. In addition to smartphones and smart meters, we now hear about smart clothing and smart shoes, smart lights, smart homes, smart buildings, and every trendy city today has its smart city project. Just because it has a computer inside and is connected to the Web, does not mean it is smart.
Are you being paid enough? Do you want a better job? According to a recent survey Manpower released just before Engineers Week, employers and engineers don't see eye-to-eye about the state of US engineers' skills and experience.
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