I recently resurrected my A/C, I used denatured alcohol.  Worked for me.  I
bought 2 gallons of it and poured some in high side, then blew compressed
air behind it to force through, then in low side and repeated.  I removed
the old dryer/receiver before doing this.  I then ended up disconnected the
hoses at the condenser and evaporator and purging each section(I needed to
do this anyhow since I was replacing all the O-rings).  It does not take
very much crud to clog up your expansion valve.   Once I felt I'd purged the
old gunked up lubricant out of the system, I blew it dry with compressed
air, closed up the system and pulled a vacuum for 2 hours , let it sit for
about an hour(some will say longer some will say shorter) before refilling
with refrigerant.

My a/c works decent now and has been for the past couple months.  Highway
driving in 100F weather i get down to the 50's.  Vent temps seen down to 39F
but that was in a hot Texas thunderstorm, with the rain evaporating off the
condenser helping a lot.

-Ry
http://www.google.com/profiles/rylincoln

On Wed, Jul 14, 2010 at 2:45 PM, Stephen Grisanti <bike2vcu@yahoo.com>wrote:

> Numerous A/C threads on the Samba address this and the substance of choice
> seems to be the stuff used to purge truck air brake systems, which one guy
> says is straight Methanol (wood alcohol).  This should be readily available
> by the gallon and pretty cheap at HoDepot or the like.  Pour it in a section
> of hose or a component and chase with compressed air to clean out the
> accumulated "snot," as they call it.  You may want to search for some of
> those threads for verification.
>
> Stephen
>
> --- On Wed, 7/14/10, John Rodgers <inua@CHARTER.NET> wrote:
>
>
> From: John Rodgers <inua@CHARTER.NET>
> Subject: Recommended A/C System Flush
> To: vanagon@GERRY.VANAGON.COM
> Date: Wednesday, July 14, 2010, 3:25 PM
>
>
> I'm about to resurrect a long dead A/C system on my daily driver, and
> - since the lines have been open and not connected to a compressor
> (removed long ago) the system needs a major flush. What is recommended
> for a system flush, and what will work without costing an arm and a leg.
> One repair station said the flush stuff is really expensive, so just
> wondering.
>
> Thanks,
>
> --
> John Rodgers
> Clayartist and Moldmaker
> 88'GL VW Bus Driver
> Chelsea, AL
> Http://www.moldhaus.com
>
>
>
>
>