Typo - should be r134a. Sorry, to many thumbs and not enough fingers. There
are several toutube videos out showing servicing with Dust Off, a computer
cleaner comprised essentially of difluoroethane, a refrigerant. References
are made to EPA allowances for difluoroethane cas# 75-37-6 - which is what
Dust Off is. The big thing is it is as good as R12, not toxic to the
environment, unlike r134a it can be bled into the air. Though flammable it
is insignicantly so, inexpensive (about $13 at Wally World for a 3 can
package. This is what I've gleaned so far. Don't know about mixing the
difluoroethane with residual r134a or if more PAG OIL is needed. I imagine
there are other questions too, that need answering, but this seems to be
aVanagon owners dream. One caveat - as I currently understand it, this is
approved for home installation by yourself. You can't have it done in a
shop.

Here are some links.

https://m.youtube.com/watch?v=O70Ww9vzjvg

https://en.m.wikipedia.org/wiki/1,1-Difluoroethane

This video below also includes a flame test for flammability!

https://youtu.be/3wkBnhcyO3Y

From what I have found so far, difluoroethane is the same as HFC152 which
apparently has been approves and will replace r134a soon. This is in Dust
Off.

I plan to use it unless good reaslns are laid out not too!

John
On Jun 2, 2016 17:40, "Dennis Haynes" <d23haynes57@hotmail.com> wrote:

> What is R135a? I know, a type, R134a. Anyway While R152a is being used in
> newer vehicles instead of the R134a I do not know if it is approved for
> retrofit or if it is compatible with the expansion valve and other
> components of an R134a system. As summer is here let's do some research.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of John Rodgers
> Sent: Thursday, June 2, 2016 12:17 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: AC SERVICING
>
> Can difluroethane be safely mixed with residual  r135a?
>
> JOHN
>