Has anyone converted their A/C to r134a? I was wondering how it cools? I have a factory A/C car. It currently has a York compressor that gone bad. With the price of R12 and it's getting hard to find in my area I m thinking of converting to R134. Also I would like to know if anyone has installed a Sanden compressor? Do you like? How does it work? My car is a driver and having A/C again would be great. Thank you in advance
Dan
I have done the 134 in two cars. My 68 GT350 and my Pantera.
The Shelby is using the stock York compressor and the Pantera a Sanden.
The difference in the refrigerant is really in output temperature. The R12 typically would produce a/c outlet temps in the 32 to 34 degree range and the 134 I can only get down to about 37. It isn't a huge difference unless I suppose you are going to attempt to use it in Phoenix or Vegas in the summer?
The Sanden is a little quieter then the York but the most noise is from the clutch locking and unlocking.
As fas as changing oil, don't. Just charge the system up with the 134. It doesn't seem to have any significant difference to the compressors at all.
In your Shelby I'd keep the original compressor. The difference in look is very significant and the engine compartment is very much part of the character of the look of the car.
The Yorks are simple to rebuild. No BFD at all.
keep in mind that you only need 80% of r134 to charge system /if you charge it the same amount as r 12 it will raise the evap temp . I too have done the conversion and same issue with output temp not as cold as R12
http://refrigerantsinc.com/fr12.html
Keeps my Mustang frigid.
Thanks for the information everyone. My car came with a Tecumseh compressor originally. A Previous owner installed the York compressor. I don't have a Tecumseh compressor to rebuild. I've heard the piston type A/C compressors don't like too much eng rpm that's why Ford installed 3.00 rearend gears in cars with A/C in 1969. That is the reason I was inquiring about the Sanden compressor.
the sanden comp. works better , and draws less horsepower. the real important thing to replace is the condenser. the 134a condenser is a multi pass tube type and will lower the temp. inside to what an r12 system would do.
Quote from: Bigblock on October 01, 2019, 02:31:47 PM
http://refrigerantsinc.com/fr12.html
Keeps my Mustang frigid.
thanks for the info
+1
During a R-134 retrofit we used to replaced black rubber o-ring by green silicone o-ring which they are compatible with.
Keep in mind R-134 molecule is smaller than R-12 and leak easier.
Patrick
Other than the seals, which I had heard had to be replaced, do you not do anything with the compressor valves?
After two ill fated attempts with a York to 134 conversion , I switched to a Sanded and it was the best thing I ever did. Quiet . cold , and trouble free for 5 years now. I used the adapter "cradle" , a new drier, a couple of new fittings and the green o rings. Charged it with a ACPro kit and life is cold now.
Randy