How to flush the old mineral oil and debris out of your classic car A/C system. You should do this when converting from R12 to R134A refrigerant.
Notes:
1. This method only works on old school, tube and fin designs. It will not work well with modern parallel flow condensers. The holes on modern condensers are too small to effectively flush debris out of.
2. R134 will not absorb and distribute old school mineral oil. It requires PAG or Ester and so we want the old oil out of there!
3. After flushing, blow compressed air through the flushed evaporator and condenser to remove residual solvent.
4. Do not flush rubber hoses or compressor! It's best to just replace these components. However, if your compressor is still good it is okay to drain the old mineral oil and refill with PAG the same amount you drained.
5. Add 2 oz of PAG to your evaporator and 2 oz to your drier before reassembly.
6. Reassemble with all new silicone o-rings (the green ones). R134 will permeate the old nitrile o-rings (and the old style hoses too).
7. After reassembly, a vacuum must be applied to remove air before charging with R134. If you don't do this, it ain't gonna work at all.
8. R134 will never cool as well as R12. It can be helped by upgrading to a modern parallel flow condenser. Even then, it is a good idea to add a fan to the condenser to keep air moving when the vehicle is stopped.
I didn't intend for this to be a how-to on a conversion, but thought I should include the basics so you know what you are getting into.
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