How to recharge the A/C?

1997 CHEVROLET SILVERADO
172,000 MILES • 7.4L • V8 • 2WD • AUTOMATIC
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DAN HOOKS
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Changing out an A/C line that had a pinhole in it since 2018. What all needs to be done now to recharge?
Jul 4, 2023 at 4:58 PM
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JACOBANDNICKOLAS
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Hi,

The system should be vacuumed and then recharged. Vacuuming, also known as evacuation, involves removing any air and moisture present in the A/C system. This is important for a couple of reasons.

First, if air remains in the system, it can cause poor cooling performance and potentially damage the compressor. Vacuuming removes the air, ensuring that only refrigerant is present in the system.

Also, moisture is another enemy of an A/C system. If moisture gets into the system, it can react with the refrigerant and form acids that damage the internal components. Additionally, moisture can freeze inside the system, blocking the refrigerant flow.

Here is a link showing how it is done:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Let me know if this helps or if you have other questions.

Take care,

joe
Jul 4, 2023 at 11:21 PM
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DAN HOOKS
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So just replace, hose with pin hole and dryer and orifice tube filter, then vacuum system and charge?
Jul 5, 2023 at 3:34 AM
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DAN HOOKS
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I don't need to spray A/C cleaner in the system. Just pull vacuum and charge? What about pay oil?
Jul 5, 2023 at 6:49 AM
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DAN HOOKS
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Pag oil?
Jul 5, 2023 at 6:50 AM
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JACOBANDNICKOLAS
  • CERTIFIED EXPERT
  • 110,175 POSTS
Hi,

If it was a hose you replaced, the PAG should be fine. As far as charging it, if you vacuum the system, it should be fine. If the compressor failed, then it would need to be cleaned.

Let me know.

Joe
Jul 6, 2023 at 8:28 PM