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When installing the high-pressure switch in the rear head of the new compressor, is a new O ring required?

Tiny
43ZX2
  • MEMBER
  • 1999 GMC SIERRA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 27,000 MILES
High Pressure Switch Installation on new Replacement A/C Compressor. When installing the high pressure switch in the rear head of the new compressor, is a new O ring required, or can one simply remove the snap ring and plug and install the switch?
Monday, July 22nd, 2024 AT 1:04 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 45,347 POSTS
Usually, the O ring will be okay because it was new at the factory when they assembled the new compressor. For clarification I included a diagram so we can be on the same page. Check out the images (below). Let us know if you need anything else.
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Monday, July 22nd, 2024 AT 1:40 PM
Tiny
43ZX2
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  • 3 POSTS
Thanks Ken.
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Monday, July 22nd, 2024 AT 1:42 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 45,347 POSTS
You are welcome, please use 2CarPros anytime we are here to help.
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Tuesday, July 23rd, 2024 AT 9:03 AM
Tiny
43ZX2
  • MEMBER
  • 3 POSTS
I'll check the O ring for any sign of damage when I remove the plug.
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Wednesday, July 24th, 2024 AT 6:33 AM

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