Thanks, David...That's what I thought, too.  Thing is, the A/C shop told me
I needed the new pressure switch and then I pay them 379.00 to replace o
rings, replace the freon, etc.  Sounds like I could save some $$ by doing it
myself. I have had the van for about 2.5-3 years and the PO did the 134A
conversion.  I don't think the system is in such bad shape.  I would like to
install the switch myself and fill it and THEN take it to him if I have a
problem.  Just don't want to vent the freon in the air.  Any ideas to avoid
this?  I know this may sound stupid, but I made the DIY $20 Brake Bleeder
and it has a tire stem installed....I wonder if I could utilize this to
catch some of the freon?  Just brainstormin' Thanks again.
CheapSkate Michael in San Antonio
91GL Weekender AT 2.1L 'Gringo'

On Tue, Aug 10, 2010 at 8:31 AM, <dvdclarksn@aol.com> wrote:

>  No. you will have to evacuate the system, replace the switch and then
> recharge your ac.
>
> David Clarkson
> 90 Westy
>
> -----Original Message-----
> From: Michael Sullivan <sandwichhead@GMAIL.COM>
> To: vanagon@GERRY.VANAGON.COM
> Sent: Tue, Aug 10, 2010 8:49 am
> Subject: Replacing pressure A/C Pressure switch w/o losing Freon
>
>
>
>
> Can I take the pressure switch off the high pressure line in the DS side
>
>
> rear D pillar and pop the new one in and NOT lose all the freon? Thanks.
>
> Michael in San Antonio
>
> 91GL Weekender AT 2.1L 'Gringo'
>
>
>
>