A/c system on the low side?

2017 HONDA CIVIC
167,500 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
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KSIPES04
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After vacuuming the system down the gauges should read 0 correct on the low side? High side? When putting in refrigerant what does the low side gauge need to read at what psi? And on the high side is it between 200-250?
May 25, 2025 at 6:39 PM
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STRAILER
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  • 55,616 POSTS
After vacuuming the low side gauge should read 28-29 in of vacuum. Yep, the high side should be between 200-250 and the low should be between 35 and 55 the high pressure will be on a hot day. This is a great video to help you with the recharge:

https://www.youtube.com/watch?v=4EqdrBVb0sY

If the system does not hold vacuum do not charge it, the system is leaking FYI. Please go over this guide and get back to us.
May 26, 2025 at 6:53 AM
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KSIPES04
  • MEMBER
  • 2 POSTS
While vacuuming the A/C system down what does the low side gauge need to read is it 0? High side? When adding refrigerant what does the gauges need to read once the system is full, low side? High side?
May 26, 2025 at 6:54 AM (Merged)
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STRAILER
  • ✓Experienced Mechanic
  • 55,616 POSTS
Please check out the response post above.
May 26, 2025 at 6:54 AM
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