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Possibly the compressor has a hole in it. My 2000 Sonata had the similar problem soon within a year of purchasing. The dealership replaced under warranty.

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โˆ™ 2006-04-24 18:54:27
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Q: What is wrong when a 2000 Hyundai Sonata makes a hissing sound when the air conditioner is turned on and it stopped blowing cool air only warm air comes out?
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