robSC

My 2006 makes an intermittent hissing noise - usually after coming off the gas pedal. Seems to be worse when running the AC. Is this normal?

DOMINION

Could be the sound of your Rotary or Tranny. Its norm for you to hear the Trannys wind or as you put it hiss.

04RX8man

yeah we need some more info....MT or AT is it like air hissing or a humming? what year car? Location? Milegeage?

Triperformance

List your specs and mileage, and try to explain the area that you hear the noise. For example, front right tire, engine, shifter and so on. Specifics for noises are nice, I would know....I get customers saying the car laughs when turning and I work at a Toyota dealership (there high on pcp!) lol. We would love to help you out .

volcomx31

iTrader: (4)

theres a snake in your engine bay

robSC

I have a 2006 MT Shinka with around 14K. The hiss will last around 2 seconds and souds like pressure dumping. Seems to come from under the passenger side dash/floor area and is more frequent when the AC is running. I live outside Charlotte and have recently lost a pet snake...

EDZRIDE

iTrader: (1)

Engine running or shut off?

nmarz77

Most likely it's the A/C's expansion valve. It's located in the car on the passenger side. Either it's going bad or you're getting low on refrigerant due to a slow leak.

robSC

I have only heard it when the car is running. I think the AC expansion valve sounds likely. I will have the dealer check it out the next time I see them. Thanks for the help!

Triperformance

No problem, give them the specifics when you take it in though! Best of luck and let us know what is was!

HWK11

iTrader: (2)

mine makes that sound too... sometimes it even sounds like water is pouring out or something... almost like a drain..

EDZRIDE

iTrader: (1)

Check for vacumn leaks too.

nmarz77

Yeah yours is definitely bad. lol

ferg

when i first turn on the a/c and rev i can hear a hissing sound then it stops after the ac runs for a little

HWK11

iTrader: (2)

hmm.... i guess ill have a trip to the dealer during the break.

tubingchamp

iTrader: (3)

It's your supercharger.. By your name it makes it seem like you have one