The E.P.A. has officially banned the manufacture of Refrigerant 12
(Freon) after January 1, 1996. As a result, surplus supplies of R-12
will begin to dwindle over the next several years until, eventually,
R-12 will no longer be available. This uncertainty about the
availability of R-12 has caused significant concerns for Toyota dealers
when servicing HVAC systems not using R-134a refrigerant. Similarly,
the reduced availability of R-12 has prompted demands for R-134a
retrofit kits and/or alternate refrigerants. This TSB will clarify
Toyota’s current recommendations for servicing and retrofitting HVAC
systems on Toyota vehicles using R-12 refrigerant. ALTERNATE
REFRIGERANTS: Previously, the E.P.A. has endorsed other alternative
refrigerants. These endorsements, combined with the uncertain future
availability of R-12, have led to a limited acceptance of using
alternative refrigerants when servicing or retrofitting R-12 HVAC
systems. Use of these refrigerants can lead to several service related
problems, including: Poor system performance and leak detection
capabilities. Contamination of R-12 and R-134a during refrigerant
recovery and recycling. Recently the E.P.A. released a statement
clarifying that approval of alternative refrigerants relates only to the
toxicology, flammability, ozone depletion and global warming
characteristics. The approval does not imply acceptability of
alternative refrigerants use with respect to serviceability or
performance
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