Posted by Pops1532 on May 26, 2014 at 12:21:34 from (98.227.133.60):
In Reply to: R12 posted by jimg.allentown on May 26, 2014 at 11:35:40:
jimg.allentown said: (quoted from post at 18:35:40 05/26/14) Sorry to disagree, BUT....
First, the condenser is NOT bigger or different in any way from R-12 to R-134a. At least not on Fords. I had to replace one on a 1992 Taurus (R-12 system) that had been punctured by a stone. Got one from a 1995 one that used R-134a. Same part number, same engineering number on the old and replacement parts. Changed a leaking evaporator on my 1993 Explorer (R-12 system). Got a replacement from a 1994 Explorer - R-134a system. Again, same part, same part numbers.
In the beginning, the mechanics in my shop were told that the two refrigerants were totally incompatible. Turns out that was just propaganda to force customers to spend a fortune having their systems "converted" to the new gas.
Systems designed for R-12 will work just fine on R-134a. The main differences are the oil and the efficiency of heat transfer. Systems were NOT redesigned for R-134a.
You said it yourself....efficiency of heat transfer. That's the condenser.
Just because Ford used the same condenser doesn't mean efficiency was the same.
There's some good info on this site....
http://www.aa1car.com/library/retrofit.htm
The info in that link claims 3-15% loss in efficiency when converting from R12 to R134A.
It's also not accurate to say systems were not redesigned for R134A. Besides R134A requiring a larger or at least more efficient condenser, the discharge pressures are higher in a R134A system than an R12 system. Some of the lighter duty R12 compressors don't last long with the higher work load of R134A.
Also, the materials used for the O-rings and hoses were changed with the change to R134A. Some of the old compressors are not at all compatible with R134A.
It looks like the OP wants to service his own A/C. Unless he were to vent the R12 into the atmosphere (a great big NO-NO with the EPA), he would need the equipment to recover the R12 prior to filling with R134A. That's not a typical DIY project.
This post was edited by Pops1532 at 12:22:30 05/26/14.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
... [Read Article]
Latest Ad:
Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
