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Compressor running when not turned on?

bradleyheathhays
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bradleyheathhays

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I have an '02 Taurus with 85k miles on her that I just bought.  Today when I was checking something under the hood I noticed this metal line cold and dripping with water...

 

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I had the air on but turned to the position of arrows pointing out of the dash and floor vents only.  The defrost or a/c function was not selected.  It seems to be doing it consistently.  I haven't traced all the parts of this car's a/c system yet but I don't know of anything else under a hood that turns cold and sweats.  Why would my compressor be working when it's not selected?  What tests should I run?

 

 

 

 

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