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Well i dont know how else to explain it.. every now and then on my 05 D i get this hissing sound when the ac is on.. it almost sounds like nitros being released does in the movies.. just wondering if anyone experiences this also..
 

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Yes I can hear that when I let off the gas even without the AC on. I took mine in and they said it was normal. Had to do with the evaporator or vacumn, I don't recall. Just turn up the music :rck:
 

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It is normal. There is R134a refrigerant running thru lines under the dash that then passes through a evaporator and an expansion valve that makes the refrigerant turn from a warm liquid to a cold gas. A little hissing is common from under the dash especially during warm weather.
 
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