The instructions I've had with every new suction valve say "Don't blow air
through it".
If you're going to try to flush the oil from an A/C system you need to
remove both the dryer and suction valve and turn the compressor so it sits
in a way to gravity drain the old oil.
Also not a bad idea to blow all the moisture possible from your compressor
tank and your water trap before you blow your investment with moisture
introduction.

Stan Wilder
Engine Ceramics
214-352-4931
www.engineceramics.com
----- Original Message -----
From: "Robert Fisher" <refisher@MCHSI.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, June 29, 2005 3:41 PM
Subject: Re: R134 conversion

> You can use a regular 'ol rubber tip 'air gun' as a 'flush gun'... couch
> change at Wal-mart.
> Speaking of acsource.com , however; if your gonna get into self-servicing
> your A/C system(s), this manual is a real good basic primer and reference:
>
> http://www.acsource.com/index.asp?PageAction=VIEWPROD&ProdID=8
>
> Start with that and adapt what you learn to the Bentley and the info in
the
> archives, etc. and it'll take all the mystery out of it. Like I said
before,
> if you can work on yer own brakes (or that hydraulic clutch system!) you
can
> service yer own A/C, no sweat.
>
> Cya,
> Robert
>
> ----- Original Message -----
> From: "Roger Sisler" <rogersisler2000@YAHOO.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Wednesday, June 29, 2005 12:51 PM
> Subject: Re: R134 conversion
>
>
> > Try www.acsource.com. The flush gun is the greatest , simple invention
> > yet.The power will be with you, and you will feel it when you pull the
> > trigger.Use mineral spirits,or a/c flush . The a/c flush costs about $40
a
> > gallon. Thats got ripple beat.  It took 2 gallons to do my westy-of
> > mineral
> > spirits , that is.