Volkswagen Passat 1995 Repair Manual page 123

A/C refrigerant system, servicing
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CAUTION!
Always use separate refrigerant
recovery/recycling/recharging servicing
equipment for R-12 and R-134a systems. DO
NOT use one piece of equipment for both R-
12 and R-134a systems. The residual traces
of refrigerant inside the equipment will
contaminate and damage the equipment.
Servicing equipment includes
recovery/recycling/recharging unit, charging
station, vacuum pump, manifold gauges, etc.
DO NOT use R-12 servicing equipment on R-
134a systems or R-134a equipment on R-12
systems or damage to both the vehicle A/C
system and servicing equipment may result.
Use only equipment designed to meet
Society of Automotive Engineers (SAE)
standards.
R-134a and R-12 systems use different size
service fittings. NEVER use adaptors to
convert an R-12 fitting to R-134a size or R-
134a fitting to R-12 size.
Note:
Refer to safety measures starting on
1 prior to discharging or charging A/C refrigerant
system.
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12/7/2004