Date: Wed, 16 Jun 2010 23:58:05 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Need AC chart expected measurements...
In-Reply-To: <AANLkTiluZcRkn3j8exOZRudrfefeGuMsTFk3kzPRDrHo@mail.gmail.com>
Content-Type: text/plain; charset="US-ASCII"
Hoses, connections, evaporator, and condenser are all capable of leaking. So
is the Receiver/Dryer. In fact this part has a thermal/pressure relief plug.
There are various tools, sensors, dyes etc to help locate AC leaks. The
proper test is to charge the system with nitrogen and make sure it can hold
pressure before evacuating and filling.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Steven Johnson
Sent: Wednesday, June 16, 2010 3:00 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Need AC chart expected measurements...
Hey Dennis,
Thanks for the input. I've replaced the compressor, expansion valve and
the receiver/dryer and several
gaskets all to have the system still leak out. What else leaks?
Steven
On Tue, Jun 15, 2010 at 9:34 PM, Dennis Haynes
<d23haynes57@hotmail.com>wrote:
> Proper charging of an automotive AC system, (or most AC systems) is done
by
> weight. System pressures are then the result of proper operation and
> external conditions. When using r-134A proper fill is approximately 85% of
> the fill for R-12. As R-134A is azeotropic, (I think I got that right) it
> is
> a poor practice to top leaky systems off. If it needs more than 10% you
> should fully evacuate and recharge.
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Ken Wilford
> Sent: Tuesday, June 15, 2010 10:25 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Need AC chart expected measurements...
>
> Steven, I use the AC chart from any other VW Bentley from the 80s or
> early 90s. They all have them except for the Vanagon. On the low side
> you want to see between 35-40 psi wen fully charged. The high side goes
> up to around 250 psi, maybe higher when fully charged but I usually just
> pay attention to the low side unless the system is fully charged and
> still not working properly. Also the low side metal pipe coming out of
> the compressor will start to get cold and stay cold when the system is
> about full. I have been servicing these systems for many years and if
> you follow these guidelines you should be able to charge a normal
> system. If you have any other questions please feel free to pmail me.
>
> Ken Wilford
> John 3:16
> www.vanagain.com
>
>
> Steven Johnson wrote:
> > Hi folks,
> >
> > I'm using a manifold gauge set on my '91 Campers AC system and cannot
> find
> > anything in the Bentley that shows what pressure to expect (high or low
> > side)
> > at given ambient temps. Is there such a fact sheet or spec.?
> >
> > Thanks,
> >
> > Steven
> >
> >
>
> --
> Thanks,
> Ken Wilford
> John 3:16
> www.vanagain.com
> Phone: 856-327-4936
> Fax: 856-327-2242
>
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