Automotive Air Conditioning Information Forum (Archives)

TRB on Thu January 05, 2006 5:26 PM

Did you know that...the refrigerant oil color can often provide us with some idea of the compressor and internal system conditions? Black Oil indicates carbonization caused by air (moisture) in the system. Brown Oil indicates copper plating caused by moisture in the system. Grey or Metallic oil indicates bearing wear or piston scoring. Piston scoring may be attributed to high head pressure caused by system moisture.

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Edited: Tue November 28, 2006 at 4:36 PM by TRB