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2007 Hyundai Elantra Question: What is the high-pitched whistling noise when my a/c is turned on?

 

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DNML911, 2.0L 4 Cylinder, Willowbrook, IL, May 06, 2013, 19:26
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The a/c works fine but when it becomes hot outside, the noise gets louder. The max a/c setting on the knob does not work at all either. As you accelerate, the noise gets louder as well.

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