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Old 06-29-2013, 11:57 AM
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Hissing noise

so a few days ago I had my half brother, an hvac specialist, check out my AC since it isn't working (the AC compressor never engages). He checked the freon, which seemed to be low, and spun the center of the AC compressor with his hand to make sure it wasn't locked up. After all of this was done, I fired up the jeep and a terrible hissing noise started. As soon as I turn it on, it starts. It seems to stop when I am accelerating quickly, which I don't like to do because I prefer to keep my gas mileage somewhat respectable.

Does anyone know what this could be? I'm guessing is has to do with whatever my brother did. Maybe something is loose now and rubbing on some metal? I don't know why it would stop when I accelerate quickly though.

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Old 06-29-2013, 06:38 PM   #2
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Sounds like a vacuum leak. When you give it gas, the vacuum goes away for a second and you don't hear it.
You need to fix it because it can affect the running of the engine. It should not be hard to find, just pop the hood and look for the noise.

Probably see a loose hose that will just slip back on a fitting.

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Old 06-29-2013, 07:51 PM
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Quote:
Originally Posted by OldJeepCJ5 View Post
Sounds like a vacuum leak. When you give it gas, the vacuum goes away for a second and you don't hear it. You need to fix it because it can affect the running of the engine. It should not be hard to find, just pop the hood and look for the noise. Probably see a loose hose that will just slip back on a fitting.
Found it, I'm all fixed up. Thanks a ton, you're a savior.
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Old 07-29-2013, 10:41 AM   #4
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Where was the noise coming from? I'm having the same issue.. Thanks.
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Old 08-13-2013, 05:16 PM   #5
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Same here! Starts making the noise just as it gets to full temp then last anywhere from 3 to 6 mins. It seems like its coming from front driver side of engine.
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Old 08-13-2013, 07:00 PM
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It was a hose that had been pulled out of place by the AC compressor

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