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| Re: [GMCnet] AC Diagnosis [message #222528 is a reply to message #222525] |
Sun, 15 September 2013 14:51   |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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My recommendation on how long to leave the vacuum pump running, was based
on two things. 1. My General Motors training on air conditioning. It goes
something like this: If the system has NO existing pressure, and/or has
been opened to the atmosphere, consider it to be contaminated. Do the "full
meal deal" . That means remove the dessicant/dryer and replace it, flush
the system, (I was taught to use R -12) but we know now that is a bad
thing. Then purge the system..In high humidity areas, pull a full vacuum at
least overnight, then a "Suitable" wait time under vacuum to leak check it.
Then, charge the system with the appropriate refrigerant as well as the
correct amount depending on size of system and the temperature range. Check
under load, look for at least 45 degrees temp variant from ambient air at
the vents.
2. Personal experience with various A/C systems. But, all that being said.
Will a "short pull" on the vacuum pump work? Yes, most of the time. IF THE
SYSTEM IS NOT CONTAMINATED..Jwihf.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Sep 15, 2013 12:25 PM, "A." <markbb1@netzero.com> wrote:
>
>
> Emery Stora wrote on Sat, 14 September 2013 19:37
> > You are doing overkill on the vacuuming. You don't have to do so much.
> >
> > I have done many systems where I vacuumed for 1 or 2 hours and they all
> worked fine.
> >
> > Emery Stora
> I told him that Friday, but he got a couple of posts subsequent to that
> telling him to run it overnight.
>
> I can only guess they overlooked the fact that he put in a spanking new
> dehydrator immediately before sealing it up and applying the vacuum.
> --
> '73 23' Sequoia For Camping
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
> _______________________________________________
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>
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| Re: [GMCnet] AC Diagnosis [message #222574 is a reply to message #222560] |
Sun, 15 September 2013 18:52 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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none if it's sound.
--johnny
--------------------------------------------
On Sun, 9/15/13, Rob Mueller <robmueller@iinet.net.au> wrote:
Subject: Re: [GMCnet] AC Diagnosis
To: gmclist@temp.gmcnet.org
Date: Sunday, September 15, 2013, 11:06 PM
G'day,
Can anyone tell me what harm can be done to the A/C system
if it is left at vacuum overnight?
Regards,
Rob M.
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] AC Diagnosis [message #222583 is a reply to message #222560] |
Sun, 15 September 2013 19:28 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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| Robert Mueller wrote on Sun, 15 September 2013 16:06 |
G'day,
Can anyone tell me what harm can be done to the A/C system if it is left at vacuum overnight?
Regards,
Rob M.
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Leaving the system in a vacuum over night or for a week can't hurt it but if it has a small leak air will be sucked into the system. If the stuff that was oozing out was water rather then oil leaving the vacuum pump running over night would be a good thing. Also when pulling a vacuum it is a good practice to run the vacuum pump a little while then break the vacuum with refrigerant to 0 pounds then pull your deep vacuum. On large systems doing it a few times is better.
Roy Keen
Minden,NV
76 X Glenbrook
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