I received some e-mails asking me for the vw retrofit instructions
that came with the kit.
It's only one page in English, and the other pages are in other languages.
I am posting the page in English for your reference only,
in case you are interested in purchasing this kit from your dealer.
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INSTRUCTIONS FOR CONVERTING R12 CONDITIONING
SYSTEM TO R134A

Notes:
<>Observe safety precautions when working on vehicles with
air conditioning system => Workshop manual
-Air conditioner with R12
<>Installation set,part No.357 820 794 is required for conversion.
This set contains two adapters (for low and high pressure valves)
and a sticker.
<>Additionally order the receiver (reservoir) including it's O-rings
and the compressor O-rings (from parts catalogue).

Work sequence:
-Extract refrigerant R12 using extraction station V.A.G 1691.

-Remove refrigerant oil from compressor - Two proposals for this:
  Proposal 1:
   Remove oil drain plug. Push a 200 mm long and 5 mm thick hose
   as far as possible into the compressor and extract oil with an
   oil extraction pump (for example Fischer K�lteklima,
   order No. 823 2251).
  Proposal 2:
   Remove compressor, remove oil drain plug and tip refrigerant oil out.

-Fill compressor with refrigerant oil for R134a (part No. G052 154 A2)

Quantity(capacity)
Compressor                              Quantity in cubic centimeters
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Manufacturer: York                                 100
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Manufacturer: Sankyo,Sanden SD 508     100
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Manufacturer: Sanden SD 510                 100
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Manufacturer: Sanden SD 709        135 only cars
                                                    240 only Transporter
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-Seal compressor and re-install if necessary - use new O-rings.
-Renew receiver (reservoir) -use new O-rings.
-Screw adapters on to high and low pressure valves.
-Stick R134a label over R12 label.
-Evacuate
-Fill with R134a refrigerant using service station V.A.G. 1770
 or V.A.G. 17771.

Quantity (capacity)
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Vehicle              Production Year        Quantity in gramme
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Golf Cabriolet           1985 to 1993              800
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Golf/Jetta/Vento       1985 to 1992              800
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Scirocco/Corrado     1985 to 1992              800
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Passat/Qantum        1986 to 1988            1200
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Passat                     1988 to 1992            1050
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Transporter/Vanagon  1985 to 1992           1350
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                                738 350 86

*note: that's how they spelled "Qantum"