Date: Fri, 5 Aug 2016 09:30:29 -0500
Reply-To: John Rodgers <jrodgers113@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: John Rodgers <jrodgers113@GMAIL.COM>
Subject: Re: AC servicing woes
In-Reply-To: <BAY405-EAS4099C6E9F270C2B0629D4B8A0180@phx.gbl>
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Ah! Enlightenment!!
The HFC152A I have used is a close match to R12, just slightly less
dense. I didn't add any more oil. It is entirely possible the wrong oil
was put in when it was serviced. It bears flushing I think!
In my '91 Carat, there was still a small amount of pressure, even after 15
or so years. It has never been converted to R134a, so the system should
have only the mineral oil in it. Perhaps even the original oil from the
factory. Would that be a reasonable expectation.
Finally, this is a Sanden 709 compressor for reference.
Thanks
John
On Aug 5, 2016 08:30, "Dennis Haynes" <d23haynes57@hotmail.com> wrote:
> Flushing the system should include the condenser and evaporator. It all
> gets loaded with oil. When are vans where built R12 with mineral oil was
> still the prevalent standard. No need to mention other options. As for the
> quantity that is the total quantity. When adding to the system you have to
> consider what is still in the compressor. Too much oil is not good. As
> important as it is for compressor lubrication it is also a non-condensable
> (or non-vaporizing) contaminant which reduces system efficiency and excess
> coating reduces heat transfer efficiency. PAG oil is generally used for OEM
> R134a systems. The Ester oil is used more for conversions as it will mix
> better with residual R12 oil and avoid the complications there.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of John Rodgers
> Sent: Friday, August 5, 2016 9:11 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: AC servicing woes
>
> The kind of oil usec in the AC systems on my Vans has come into question.
> In looking thru the BENTLEY, Ifind no reference to AC oil at all. At
> ADVANCE AUTO PARTS their parts and service computer for the Vanagon shows
> so many ounces of PAG OIL - or - so many ounces of mineral oil. Can anyone
> quote me a rererence as to what it is supposed to be and what quantity???
>
> Next question: when flushing the system, is it lines only or does the
> flush material also get washed through the condenser and evaporator???
> I have a new receiver/drier to put on after the flush.
>
> John
>
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