Automotive Air Conditioning Information Forum (Archives)
Convertering R134a compressor back to mineral oil, how?
Leggie on 
Fri July 13, 2012 5:36 PM 
My system is still original R12. A compressor I'm buying off of a wrecked car has already been used with R134a and POE or PAG oil.
How do completely clean out the R134a oil so I can use it with MO and R12 in my car?
bohica2xo on Fri July 13, 2012 7:31 PM
You flush the compressor with the oil you intend to use.
Compressor Flushing Procedure
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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.
Cussboy on Fri July 13, 2012 8:57 PM
In 2003 the Air Pro rebuilt compressor for my '88 that I bought from the board sponsor was filled with oil for R134a (I checked it by FTIR spectroscopy). I flushed it with R-12 type mineral oil a few times, then filled it and used it. Still good.
Co-worker a month later bought Air Pro rebuilt compressor there for his '90 (both Mazdas), that had correct mineral type oil in it already.
mk378 on Fri July 13, 2012 10:24 PM
Check your used compressor for leaks first. After completely assembling it, check any R-12 system for leaks under pressure with some other gas before committing to charge with R-12.
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