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Answered 2013-06-24 05:01:21

First you want to determine why the system needs charging. If it has a major leak, you will be wasting Freon, and letting a Pollutant into the atmosphere. Also, if the system has lost all of its charge, it will need to be EVACUATED after the leak is repaired. Then, a Freon charge and Oil can be added.

If the system is low on Freon, but no leak is present, then you charge the system by connecting a Freon source to the LOW PRESSURE connector via Hose and Fittings. The Low Pressure line is the one that is COLD. You can get complete recharge kits at auto stores, or Walmart.

While the AC system is running, you can add Freon to it. Kits will contain a Pressure Guage that will show you the safe zone for adding GAS. Never turn the source bottle upside down! This will feed Liquid to the system and could damage the compressor.

Do not over charge the System. More is not always better. Monitor the AC Air Temperature with a decent thermometer in the Center Vent of the Dashboard. Something between 40o F and 55o F is good. Higher OR Lower could be a problem.

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