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I have a couple that came off of a sealed closed system many years ago. They've been stored in a clean and dry area since then. Can these be used again or just throw them away?
 

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Personally I would reuse them if:

a) I knew the system they came from was in perfect condition with no disintegrating compressor or moisture in the system.

b) I was sure that the refrigerant oil was the same as the system I was installing it into.

c) The filter/dryer was immediately sealed so no moisture or foreign objects could enter.

The folks on here with all the bucks and no worry about a budget will tell you to pitch it and buy a new one.
 

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Some AC shops can rebuild them, they unsolder them replace whatever mistery is inside and solder them back up.
I purchased a new one for my car because it was only approx $35 and found one locally.
But if it is hard to find, I would look into rebuilding it.
 

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No mystery as to what's inside them, it's desiccant. Once exposed, it starts to break down. This is what causes the problems by causing blockages in the orifices.
 

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If they were open to the air for more than a month then get rid of them.
 
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