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Old 06-29-2013, 08:06 PM   #12
thom4782
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Join Date: Sep 2010
Location: Foster City CA
Posts: 1,099
Great news. If your system is old, then it's reasonable that you were low on refrigerant and it might stay cool for years.

It's also still possible that you have a leak. If the system loses it ability to cool in a few days, the leak is large. If it takes several weeks or months, the leak is likely small.

By any chance did the bottle of 134a include UV dye? If so, you can buy a cheap UV light to look for dye. If you find dye, that's were you'll need to replace a component.

If you didn't put dye in the system and it looses its ability to cool, you've got two options. Take it to an AC shop and have them use a sniffer to detect leaks. Or, you can refill again with 134a that also contains dye and look yourself. There's a trick to look for dye in the evaporator. Pull the drain hose and look for dye inside the tube.

Hope you've got it fixed and you wont need to do anything more.

BTW: if you have a meat thermometer, you can put it inside the vent to see what outlet temperature you're getting. It should be 45 degrees or less.
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