Which amounts to more load on the engine for given amount of cooling.
The condensers are also redesigned.

  ----- Original Message ----- 
  From: Stan Wilder 
  To: vanagon@GERRY.VANAGON.COM 
  Sent: Wednesday, June 16, 2004 6:56 PM
  Subject: Re: R12 to R134a Air Conditioning Conversion

  You may also notice that they simply spin the compressor faster when they
  use 134r.

  Stan Wilder

  ----- Original Message -----
  From: "David Brodbeck" <gull@GULL.US>
  To: <vanagon@GERRY.VANAGON.COM>
  Sent: Wednesday, June 16, 2004 7:16 PM
  Subject: Re: R12 to R134a Air Conditioning Conversion

  > On Wed, 16 Jun 2004 15:58:03 -0500, Stan Wilder wrote
  > > I never said r134a was as good as R12.
  > > I just contend that if you use the 134a you might overcome the lesser
  > > cooling capabilities by adding another condenser to the system.
  > > It worked for me.
  >
  > This was Volvo's approach.  Their official R134a conversion kit for the
  240
  > included a bigger condensor.  240 model years that came from the factory
  with
  > R134a had the bigger condensor *and* an electric pusher fan to supplement
  the
  > engine-driven fan.
  >
  > My 240 was converted without changing the condensor and it doesn't cool
  well
  > at all.  I have it on good authority that a properly converted 240 will
  > "freeze your nipples off."
  >
  >
  > David Brodbeck, N8SRE
  > '86 Volvo 240DL wagon
  > '82 VW Vanagon Westfalia Diesel (ebay #2481476461)