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Air conditioner compressor making a knocking noise while running.i read that oil needs to be put in it if so where and how or do I need to plan on replacing the compressor

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Get a can of R134a refrigerant with sealant and oil and add with a hose.
Can buy at Walmart for under $30.
Buy the conversion from R-12 to R134a kit if you need to.

Sometimes adding a few ounces of oil will quiet the compressor but you have to try.

Compressor is probably a few hundred dollars to replace, so try the cheap solution first.

Posted on Jul 05, 2010

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Posted on May 04, 2016

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1 Answer

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