Is it normal to hear a hissing sound under the hood of my car?

25% Normal
15 Comments

I recently charged my A/C in my car and i sort of hear a hissing sound when the engine is running but when i turn the car off i really hear a hissing but only if the A/C is on when the engine is running and right before i turn the engine off. My A/C is still blowing cold and it doesn't feel or smell like theres any leaks and the pressure isnt dropping or the amount of freon in the system so is this a normal sound?

Voting Results
25% Normal
Based on 20 votes (5 yes)
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Comments ( 15 )
  • RomeoDeMontague
    10 years ago

    perhaps you blew out a tire and do not realize it. I know virtually nothing about cars though. You should consult a mechanic.

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  • pantychaffe
    7 years ago

    Please note: Do not substitute IIN for a mechanic. Get your car checked

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  • megadriver
    10 years ago

    I know this. My A/C sometimes does this hissing thing, but it's very, very quiet and lasts max. 5 seconds.
    I will get the car checked, cause I did have some trouble with the aircon a month ago.

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  • Geneva5
    10 years ago

    It is most likely a faulty psychic ion converter issue, a common enough problem.

    Contact yr local ketamine wizard and he should be able to fix it.

    Failing that - rubbing yr balls on the hood till they bleed then finger painting crude portraits of Katy Perry on the windshield should have the hissing sound fixed straight away.

    Let me know how you go.

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  • NotStrangeBird
    10 years ago

    Can you see the compressor cycling onn & off? Does the hissing follow that?

    What is the temp of the various A/C components & hoses? Any water or ice on anything? Puddle of water under car?

    Can you narrow the area under the hood where the hissing is?

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  • NotStrangeBird
    10 years ago

    Angry cat?

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  • Avant-Garde
    10 years ago

    Kill it with fire.

    On a more kinder note, I think you should lovingly take your car to be fixed.

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    • pantychaffe
      7 years ago

      Lol,

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  • dirtybirdy
    10 years ago

    a/c is for sissys

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  • DADNSCAL
    10 years ago

    Sounds like an A/C fitting is partially blocked. I'd have the system checked before it gets totally blocked, and it's the middle of the summer.

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  • [Old Memory]
    10 years ago

    a snake?

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    • Legion
      10 years ago

      i actually found a snake curled up under the hood of my car once

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      • [Old Memory]
        10 years ago

        oo what happened, did it slither away quickly?

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        • Legion
          10 years ago

          yeah, it did. Good thing, scared the hell out of me. It turned out to be just a black snake, but i still got to be careful, copperheads are plenty where i live.

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  • Moonbow
    10 years ago

    It could be a vacuum leak. If you don't know how to check it yourself, have your mechanic check it.

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