PAG oil?

2012 HYUNDAI SONATA HYBRID
187,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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JHEND1
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How to Vacuum Down and Recharge Your A/C System!

How come the Oil isn’t evacuated with the Freon?
Jun 6, 2023 at 4:12 AM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,414 POSTS
Pumping the system into a vacuum is done to remove any moisture from the system. In a vacuum, water boils at 77 degrees Fahrenheit. It gets pulled out as a vapor. Any refrigerant has been long gone by that time. It boils somewhere, as I recall, at around minus 70 degrees. The oil doesn't vaporize so it just sits in the system during the entire process.
Jun 6, 2023 at 7:20 AM
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