HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
View Comments: Newest First|Oldest First|Threaded View
David12345
User Rank
Platinum
Climate Control Blowing Hot and Cold
David12345   1/4/2012 3:14:09 PM
NO RATINGS
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.



Partner Zone
Latest Analysis
The new draw-it-on-a-napkin is the CAD program. As CAD programs become more ubiquitous and easier to use, they have replaced 2D sketching for early concepting.
These free camps are designed for children ages 10 to 18. Attendees are introduced to 3D CAD software and shown how 3D printers can make their work a reality. Here we check out the stops in California and Utah.
A University of Chicago graduate has invented a compact elliptical trainer that lets people work out at their desk while they work.
Dean Kamen told an audience at MD&M East 2014 that FDA regulators aren't to blame for stalling innovation in the medical device industry. Hear what he had to say.
Battery maker LG Chem Power Inc. plans to offer a new cell chemistry that could serve as the foundation for an affordable electric car with a 200-mile driving range by 2017.
More:Blogs|News
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Aug 4 - 8, Introduction to Linux Device Drivers
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: August 12 - 14
Sponsored by igus
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service