Flushing the system to remove the mineral oil and debris should be done.If you do not flush it at least replace the Accumulator/Drier a lot of the old system oil and trash will be in there it is cheap insurance it should be 20.00 - 25.00 bucks! Replace the O-tube it takes a ".072 Orifice white one" R134a and mineral oil do not work well together so leaving it in the system with R134a is recommened. There are many different suggestions when charging a R12 system with R134a. System must be evacuated before starting the charging procedure. I suggest you start with about 70 percent of the original R12 charge and add an ounce at a time until vent and pressure readings reach the best available results. Remember it is easy to over charge a system with R134a so patience is important
Let me know how it goes.
If I have helped positive feedback would be appreciated.

Answered by grease monkey
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