Yes it does say that but it also says that you can charge into a
10" vacuum. Then again if you get the newer Industrial ES-12a it
can be charged into a complete vacuum or anything up to pressure.
I would not let any air into the system.
Another good thing about the ES-12 is they are longer molecules
than even R-12 so that should mean that they will tend to leak
through the original hoses a bit slower then the R134 or the R-12.
Check out http://autorefrigerants.com/co00033.htm
On my car (83 300D) the high side is behind and to the bottom of
the Alternator in the high side pipe there. Hard to get to.
Manfred
Date: Tue, 14 Aug 2012 18:53:16 -0700
From: Rick Knoble <rickkno...@hotmail.com>
Subject: [MBZ] ES-12a Was RE: 1985 300CD Klima relay - where is it?
I was looking at the Envirosafe website and it says not to charge
the ES-12a into a vacuum.
http://www.es-refrigerants.com/
Should I vacuum the system and then let air back in?
Also, where is the high side fitting? I bought the 134a adapters,
but I can't seem to find the high side...
Rick
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