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I have the 2005 Crew Cab Sierra with a 5.3. When I'm sitting at a light idling, the AC makes what I consider an unusual amount of noise. It's kind of a mix between a gurgle and a slight metallic noise. I don't remember it being this noisy when new and I've never had another vehicle that had a noise this noticeable. I only notice it at idle, but of course when driving the vehicle itself makes enough noise to block it out. Any ideas?
 

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you might have a drive clutch going out on the compressor or worse case a compressor going out. need to pop the hood and listen alittle closer to where it is coming from....mike
 
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