EPA states he can't go to ES12 in a HFC-12 original car, and in his state of California they are serious about it.
1995-1998 Enforcement Actions under Title VI of the Clean Air Act | Ozone Layer Protection - Regulatory Programs | US EPA
Quote:
July 31, 1998: Venting CFC-12
Randy Lee Christensen pleaded guilty in U.S. District Court for the Central District of California in Los Angeles of violating the Clean Air Act. Christensen admitted to illegally venting CFC-12 into the atmosphere at the Santa Anna, CA-based C&C Distribution. The illegal venting took place when Christensen installed the replacement refrigerant HC-12a, which EPA has prohibited as a replacement for CFC-12 in auto air-conditioners, into automobile air conditioning systems. Christensen could serve up to five years in prison and be fined as much as $250,000.
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He can convert to 134a however, or recharge with r12 of course.