How to clean AC compressor and lines before sealing system?

Tiny
DAVENOOB
  • MEMBER
  • 2005 FORD FIVE HUNDRED
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Im replacing my ac compressor, dryer, and expansion valve. I have new rings to seal but I'm not replacing the lines. How should I clean the connecting parts by the rings before reinstalling? Wipe with alcohol then apply thin layer of pag oil? Thanks
Monday, June 9th, 2025 AT 1:35 PM

5 Replies

Tiny
STEVE W.
  • MECHANIC
  • 14,516 POSTS
Wipe them down with alcohol or similar, inspect for any damage or corrosion and install the new o-rings. Then apply just a quick wipe of the proper oil and tighten them down.
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Tuesday, June 10th, 2025 AT 9:28 AM
Tiny
DAVENOOB
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  • 242 POSTS
Cool that is what I thought!
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Tuesday, June 10th, 2025 AT 9:45 AM
Tiny
DAVENOOB
  • MEMBER
  • 242 POSTS
Clorinated brake cleaner is what was suggested by someone but thought alcohol would work. I don't need to scrub just make sure is clean surface. Thanks again.
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Tuesday, June 10th, 2025 AT 9:48 AM
Tiny
STEVE W.
  • MECHANIC
  • 14,516 POSTS
Don't use brake cleaner, the fittings can corrode from the contents. Alcohol will remove any crud without damaging anything. No scrub needed.
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Tuesday, June 10th, 2025 AT 11:42 AM

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