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|  R12 or R134 
			
			I am bringing in my car this week to see if my evaporator needs replacing (1987 300D). The parts guy at the dealer said that if I need a new evaporator, to convert to R134 from R12. What are the pros and cons of each? 1987 300D (176,000 mi) 2001 CLK 430 (18,000 mi) | 
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