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Is it OK to "Blend" Refrigerants?

It is never a good idea to "blend" refrigerants in your A/C System.  Only use R-12 or R-134a refrigerant in each system which they are called for.  DO NOT MIX R-12 and R-134a or any other refrigerant!  There are chemical incompatibilities between the Freon-like compounds and the compressor lubricating oils.  This has reputedly resulted in a condition of automotive air conditioning systems called Black Death.  "Black Death" is where the heat combines with chemical reaction products to sort of 'powder coat' the interior of all components of the system.  Spend the extra money to get the system properly converted.