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Q: how much oil do I put in a brand new a/c pump on a 2006 chevy cobalt on 2006 Chevrolet Cobalt

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I have a new a/c pump for a 2006 chevy cobalt I need to know how much oil to add I have the factory recommended refrigerant oil
(1) Answer
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I looked this up in a workshop manual they said to drain the refrigerant oil into a container and replace the same volume of oil that came out of the compressor up on removal, or 2.5 ounces/75 milliliters.
Phone the technical information line that supplied the air compressor to you they should have an application chart.
Four Seasons
http://www.4s.com/fourseasons/tech_tips.html
and Delphi both manufacture air conditioning compressors I am sure you can find a tech hot line number for them on the internet.