Ah yes, expanded gas as opposed to compressed.  My bad...

-----Original Message-----
From: Mike S [mailto:mikes@flatsurface.com]
Sent: Tuesday, August 10, 2010 1:01 PM
To: Jeff Schwaia
Cc: vanagon@GERRY.VANAGON.COM
Subject: Re: Replacing pressure A/C Pressure switch w/o losing Freon

At 03:28 PM 8/10/2010, Jeff Schwaia wrote...
>"270 liters of oily freon gas"...  You must have the optional
>super-duper,
>heavy duty A/C system!  ;-)

R-134a weighs ~4.25 kg/1000 liters at atmospheric pressure and room
temperature, so 270 liters is about 1.15 kg of freon. VW says the
Vanagon holds 1.35 kg of R134a, so really, he must have the
slightly-shrunken, light duty system.