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Date:   Mon, 27 Sep 2021 09:46:07 -0700
Reply-To:   David McNeely <davmcneely40@GMAIL.COM>
Sender:   Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:   David McNeely <davmcneely40@GMAIL.COM>
Subject:   Re: Air Conditioning
Comments:   To: Steve Bonde <seb007@live.com>
In-Reply-To:   <CY4PR0601MB3651966FC6827A07D08866DAE0A79@CY4PR0601MB3651.namprd06.prod.outlook.com>
Content-Type:   text/plain; charset="UTF-8"

Not only is this material listed as "extremely flammable," but also as a hazard to atmospheric ozone, which sort of obviates the reason for converting from R12 in the first place.

On Mon, Sep 27, 2021 at 7:20 AM Steve Bonde <seb007@live.com> wrote:

> Please read the MSDS sheet for this compound. CAS is the chemical > abstracts number. We chemists check these things before we screw things up > for ourselves and our passengers. I don’t have any cases but putting > something classified as extremely flammable in my AC system is not a risk I > would take. > > If you put this “extremely flammable” compound in your AC system, you do > so at your own peril. > > https://www.airgas.com/msds/001090.pdf > > I know I won’t and this is very bad advice. > > Sent from my iPhone > > On Sep 27, 2021, at 6:52 AM, John Rodgers <jrodgers113@gmail.com> wrote: > >  > I know of no one, no example, of anyone having a flame or fire problem > with using the CAS 75/HFC152a. If you know of any ACTUAL l cases I > certainly would like to know, and read the case history about it. > > On Mon, Sep 27, 2021 at 7:45 AM John Rodgers <jrodgers113@gmail.com > <mailto:jrodgers113@gmail.com>> wrote: > Those things were replaced but not the hoses. > > On Mon, Sep 27, 2021 at 7:38 AM Steve Bonde <seb007@live.com<mailto: > seb007@live.com>> wrote: > You may want to be careful with this Freon (152a). While it’s considered a > substitute for R 12, it is flammable where 134a is not. > > Molecule size isn’t really the issue. The tetrafluoroethane used in 134a > is much larger than the difluoromethane you’re suggesting without the > flammability. > > R 401a is a mixture of 152a and 124, and has a much lower flammability. > > When you made the change, did you replace the oil, filter, and drier as > well? That was the problem with my pickup. > > Sent from my iPhone > > > On Sep 26, 2021, at 9:48 PM, John Rodgers <jrodgers113@gmail.com<mailto: > jrodgers113@gmail.com>> wrote: > > > > The summer is most gone and so is the need for AC but it sure was nice > to > > have earlier. Back when I had my '88 van, I dutifully switched my system > > over to R-134a because R12 was going out and what little was available > was > > astronomical in cosy. I changed the service fittings, purged the system, > > then vacuumed the system, and added the appropriate amount of 134a. This > > was in spring. By mid summer the refrigerant pressure had dropped and was > > no longer cooling properly. I added 134a and brought it back up to speed. > > By fall of the first year the pressure was back down. This was a > > puzzlement. there was no sign of leakage any where. I didn't refill it as > > cooler weather had set in but I knew the problem had to be solved by > spring > > when I had to service it again. > > > > During the winter I stumbled across a discussion about molecule size of > > various refrigerants and how their sized was affected by hose design. It > > would seem that 134a has much smaller molecule size than R12, and > > consequently the stuff over time would leak right through the old > original > > hoses. And the original hoses is what I had. While pondering this > > situation I stumbled on a video of Dustaway keyboard and computer cleaner > > being used as a refrigerant to service the AC SYSTEM. Supposedly the > specs > > were similar to R-12 at least in molecule size so there should be only > > minimum leakage. It works great as a refrigerant cooling with the best of > > them. and I haven't changed or added to the system for a couple of years. > > You can find videos on Youtube about this. And if you decided to try it, > > make sure your can says on it somewhere CAS 75-37-6 >


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