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A/c gas keeps running out, hissing sound when I turn on the a/c

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Someone will have to look for the leak. Mechanics use a device that "sniffs" for the leak or a blacklight and dye.
The hissing could be the freon flowing thru the system when it is low on charge.

Posted on Dec 09, 2012

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I have a 2005 Pontiac that makes a hissing noise underneath the car. you can turn the car ignition on without fully starting car and it still makes hissing noise then stops.HELP!!!!!


There is a distinct sound that has a hissing component when you first turn on the key. It will last a second or two when the key is turned to the run position. When the engine started the sound will return and continue to produce the noise so long as the engine is running.

A relatively low noise is normal. If you are concerned check other like cars for the loudness level.

how to check your fuel pump

The pressure regulator on the fuel rail can also produce a sound when the fuel pump is running. The regulator is under the hood and any reasonable noise would not be a concern, A clicking sound is also normal throughout the fuel system when the engine is running created by the fuel injectors cycling.

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Try starting while depressing the gas pedal. Did it start? If so, remove engine cover (if equipped), inspect vacuum hoses and lines for cracks or breaks. If need be, have an assistant to keep the car running while you also listen for hissing noise which is also an indication of a vacuum leak. Did this work?

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SOUND LIKE LOW COMPRESSION.EXCESSIVE CARBON INSIDE ENGINE CAUSE ENGINE TO DIESELING KEEP RUNNING MAKE A RATTLING NOISE WHEN YOU TURN OFF IGNITION.

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I CAN HEAR A HISSING SOUND BY THE FUEL CAP AFTER I TURN OFF MY TRUCK


If you hear a hissing sound from the gas cap then the o ring that seals the tank is either cracked or tore. the tank has to build up pressure. thats where u r hearing the hissing sound replace it, it should stop after.

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