Charging A/C with new compressor, do I drain the PAG oil prior to installing?

Tiny
KMJTURNER
  • MEMBER
  • 2005 CHEVROLET TAHOE
  • 230,000 MILES
If not, after I vacuum the system for 30 minutes do I need to add recommended PAG oil or does this oil remain in the system and I do not need to replenish?

should I charge the system via liquid initial then switch to vapor when I get the truck running and compressor on?

The video looks like he is charging with liquid only.

Thank you for your advice.
Thursday, July 20th, 2023 AT 9:51 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,135 POSTS
Most of the time a new compressor will come with the oil needed already installed so you don't need to add more. You can charge with the gas instead of liquid, no problem. Please let us know if you need anything else to get the problem fixed.
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Saturday, July 22nd, 2023 AT 10:50 AM
Tiny
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Thank you, I will proceed with liquid charging and advise if more info is needed.
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Monday, July 24th, 2023 AT 8:51 AM
Tiny
KEN L
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  • 50,135 POSTS
Please watch this video, if you are uncomfortable just charge it with the gas. Please watch this video.

https://youtu.be/4EqdrBVb0sY

Please let us know how it goes.
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Tuesday, July 25th, 2023 AT 6:34 PM
Tiny
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Thank you, this is the video I was going to follow. Will update once all is complete.
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Wednesday, July 26th, 2023 AT 10:20 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,135 POSTS
You should be good to go, let me know what happens please.
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Thursday, July 27th, 2023 AT 3:21 PM

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