2003 Chevy Impala air conditioning/raditor info

2003 CHEVROLET IMPALA
144,000 MILES • 6 CYL • FWD • AUTOMATIC
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DJBIDDLE06
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My check enginelight came on a few days ago. I got a scan at local auto parts. They said it was my wire connected to my ac. But right now the scanner read it was only the "relay" wire to the ac. Is this true? Only a wire could be the issue? And my temp gauge goes up when I'm in the city and down when I'm driving on the highway.

Side not a week before the check engine light came on my ac sounded funny. Like it was going to drop out of my car. But stopped a few days later. And a couple of months before that the num 1 setting on my ac stopped working.
Aug 26, 2010 at 2:02 PM
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WRENCHTECH
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What is the exact code number?
Aug 26, 2010 at 2:25 PM