#1 Is there a way to test the suction throttling valve?.  I have tested the vacuum power unit and it holds vacuum so i know the diaphragm is not leaking. Can you test the function of the valve itself without disassembling it or charging the system to see if it functions. The system will be charged with R12 . #2  Who rebuilds the original accumulator dryer with new desiccant besides classic auto air located in Tampa FL ?     I have a 1964 shop manual, it instructs you how to disassemble & repair it & adj it, but no test procedure to insure that it functions correctly. Thank you

Views: 55

Reply to This

Replies to This Discussion

#1 Other than testing the vacuum power unit, I don't know of a way to test the valve itself with a fully charged system. It is a simple valve with spring pressure (including the vac power unit) on one side & pressure from the freon in the evaporator on the other side. As long as it's clean & moving freely in the cylinder, it should be good. The weak component on these tends to be the STV diaphram (different than power unit diapram). If this leaks, your freon will escape. After a few have gone bad on me and they now want $115 for them, I converted my system to a clutch cycling system. So far I have been happy with it.

#2 I don't know who rebuilds them but bought a replacement at Autozone. It is slightly shorter that the original but wasn't hard to adapt the bracket to fit it. Are you going for 100% authenticity? 

 Kurt It's going to be a driver for now , but i like to keep it original. Where did you obtain that seal? do they fail regularly?

I have had leaks from this STV diaphram a few times over the years. It looks like Old Air Products and Original Air Group have them.





  • Add Photos
  • View All


Cruise control

Started by CHRIS CARLSON in 1963/64 Cadillac Specific Discussion. Last reply by Mike Travers 1 hour ago. 1 Reply

Is anyone using an aftermarket cruise control on there 64 Cadillac? what brand & model did you purchase?Continue

carter carb paper gaskets

Started by tim sparks in General Discussion 2 hours ago. 0 Replies

had my carter carb on my 63 rebuilt when i got it back rebuilder gave me 2 rochester paper gaskets according to the ones jason sells.will those be a problem putting them on my carter? thanks in…Continue

Hood for 1964 Cadillac DeVille Convertible

Started by Ray Jacobs in Wanted to Buy. Last reply by Russ Austin 17 hours ago. 1 Reply

Hello. I'm new to this site and this is my first post. I'm looking for a hood for my 64 Cadillac DeVille Convertible in as good condition as possible.  I would appreciate any help in locating a…Continue

Tags: Convertible, Hood, Ville, De, Cadillac

Chrome trim molding

Started by Dennis P. DiBari in 1963/64 Cadillac Specific Discussion 23 hours ago. 0 Replies

Hi Jason,     I was looking for the thin trim molding for the front passenger side fender for my 64 Coupe - Series 62.  It measures 65 3/4" long.  Do you have any piece like that I can purchase?  If…Continue

Blog Posts

accumulator dryer

Posted by CHRIS CARLSON on December 6, 2023 at 10:54am 0 Comments

Who rebuilds original AC  accumulator dryers for 1964 Cadillac? I have been on Classic auto air in Tampa FL wait list for over a year ,  There is one on Old air products web site that looks very similar to the original # 21-4214A but states it fits 1962 Gm cars, The one recommended for a 1964 Cadillac is half the length 21-4215A    What  is everyone using ? I would prefer to be as original as possible. Thanks

'63 Eldorado trumpet horn + 2 standard horns restoration

Posted by Les Eastling on November 15, 2023 at 10:34am 1 Comment

My son, unbeknownst to me, had all three of the horns on our 1963 Eldorado completely restored. We had recently added the Eldorado trumpet horn to the two standard horns and the sound was not very good... we had heard good ones so we knew something was not right... but there was not much we could do to get better sound from the 3 horns. 

There is a restoration service called The Horn Works who my son…


Clock ‘64 DeVille

Posted by Matt Vander Hooven on July 23, 2023 at 7:36pm 2 Comments

Is there still a member in the Detroit area that refurbishes clocks?

Matt VH

Spark Plug Heat Range

Posted by Patrick Westphal on July 7, 2023 at 10:00am 1 Comment

I found a diagram that illustrates the main factor in determining a spark plug heat range that I was trying to describe to you during the chapter get together.

Here it is:


The main factor is the length of the ceramic insulator from the middle of the spark plug to the tip (where the spark happens)  

The insulator…



  • Add Videos
  • View All

© 2024   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service