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Registered
Join Date: Dec 2005
Posts: 3,384
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Auto AC leak question
A seal on my receiver/dryer doesn't hold vacuum - I replaced the seal and added an o-ring and can get it to hold vacuum but I want to be able to test the system with around 50psi of air before I take it to the shop that will charge it up. My question is: how do I get air or some other non-refridgerant gas in through the manifold to test the system?
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06-20-2011, 07:27 PM
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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,164
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You may have to buy a hose with a fitting and then take it to a shop that will crimp an air hose fitting on it or one you can adapt it to.
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06-20-2011, 07:40 PM
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Unconstitutional Patriot
Join Date: Apr 2000
Location: volunteer state
Posts: 5,620
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What you need to get to is a 1/4" male flare. That will connect to the hoses on your gauge. A good hardware store will have the male flare to pipe thread fittings. Then, use other fittings to adapt to your supply hose (barb, couplings, etc).
Jurgen |
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06-21-2011, 03:04 AM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,884
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I take the charge hose off and inject straight into the manifold with a rubber tipped nozzle on my air gun. You may have to remove a schrader valve on the manifold. Press the rubber tip on the manifold, open a valve, inject, close valve.
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83 944 91 FJ80 84 Ram Charger (now gone) |
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06-21-2011, 04:19 AM
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Get off my lawn!
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Charging with air will put a lot of moisture in there. Dry nitrogen is a better choice. If you use air pull a LONG vacuum, at least overnight. Receivers are the one part of a AC system pretty much designed to be replaced ever time the system is open to the atmosphere.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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06-21-2011, 04:22 AM
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MAGA
Join Date: May 2004
Posts: 10,769
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Quote:
Ditto
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne 0% Liberal Men do not quit playing because they get old.... They get old because they quit playing. |
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06-21-2011, 05:10 AM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,884
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Nitrogen is better, but I wouldn't say compressed air puts a lot of moisture in the system. It mainly depends on the condition of your air tank. I drain mine. Sure, some gets in there, but it also gets boiled off when under vacuum. Overnight is pretty liberal, but it's all dependent on the ambient temp and how well your vacuum pump works. Mine works pretty well, it's 100 degrees here and 20 minutes is more than enough.
My vacuum pump came out of a Robinaire machine, vintage '07. One fitting and wire it up!
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83 944 91 FJ80 84 Ram Charger (now gone) |
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06-21-2011, 05:26 PM
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Carrera
