Automotive Air Conditioning Information Forum (Archives)

MikeC5 on Tue November 10, 2009 12:21 PM

Is there any effective way to flush a compressor that had been used with PAG/R134 to make it ready for ester/R-12? I've let it drain for several days. Should I just pour in new ester oil and hand pump it through? The oil that came out was clean. Any help appreciated.

HECAT on Tue November 10, 2009 1:13 PM

Mike, you are on the right track. You cannot flush a Compressor with a solvent. You will want to pour in the new oil to rinse out the old.

I would also seek (I cannot answer) a verification that the seals would or will be compatible with your new application.

Here is the tip from the procedure page.

Compressor flushing and testing

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FLUSHING TECHNICAL PAPER vs2.pdf 

MikeC5 on Tue November 10, 2009 1:39 PM

Thank you Hecat. I had read that one a while ago but it didn't sink into the gray matter...

fastsvo on Fri June 11, 2010 3:00 AM

Does the same apply for going from Freeze12 to R12?

TRB on Fri June 11, 2010 11:01 AM

There is no relationship between refrigerant type and how a system should be flushed. Bottom line follow Hecat's tech paper procedures and one should be on the right track.

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