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'99 Chevy Silverado hissing sound under the hood.

My 1999 Chevy Silverado has a hissing sound that just started coming from the very tope of the engine while it is running. AC on/off doesn't change the sound and it is constant until I turn off the engine. Any thoughts on what it might be?

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  • brian_wilgus Jul 13, 2009

    I'll have to look again. It is coming from the very top of the motor-up near where I would suppose the throttle is located. It is underneath a shield. Thanks for the input though. Sorry the post is under the Ford Explorer post.

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You may have a disconnected or broken vacuum line. With the engine running, open the hood and try to locate the noise.

Posted on Jul 13, 2009

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