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Old 09-03-2006, 12:02 AM   #1
mirandm
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Default A/C Valve Core

Hi Folks,

Can the A/C low pressure Valve core be replaced without depressurizing the refrigerant? Thanks Michael
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Old 09-03-2006, 12:19 AM   #2
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Default Re: A/C Valve Core

It may just need tightening instead of replacement in which case you'll lose refrigerant. It may help to refrain from posting more than once for the same topic as your orginal post will elicit any/all replies.
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Old 09-03-2006, 10:35 AM   #3
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Default Re: A/C Valve Core

Ever change a tire valve core? The second you take it out, all the air will try to escape. It's exactly like that with the a/c valve core too.
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Old 09-03-2006, 10:58 AM   #4
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Default Re: A/C Valve Core

Quote:
Originally Posted by amazinghl
Ever change a tire valve core? The second you take it out, all the air will try to escape. It's exactly like that with the a/c valve core too.

This is true but the colder it is the less pressure it will have to escape and in theory if you were at about 35 below zero, it would not leak at all while you were doing it because it would remain a liquid.
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Old 09-03-2006, 02:32 PM   #5
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Default Re: A/C Valve Core

If you wait until the system temperature is -14degF, then you can do it. At that temperature, R134a has a pressure of just a tick above 0psig. any colder than that and the internal pressure will drop below atmospheric pressure, and the system will ingest air.

ideally, find someone with the right recovery equipment.
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