Hissing sound from under dash
10-04-2011, 05:24 PM
#1
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Join Date: 05-17-2007
Location: Orlando, Fl
Posts: 32
Hissing sound from under dash
I have an 2007 HHR with 93 K on it, and I noticed to day there is a hissing sound, (or air escaping sound coming in from under the dash.) the sound isn't my a/c, shut it off, sound is still there. But the sound goes away when I press on the brakes, making me think it's something with my brakes. I turned the car off and the sound slowly dissapaited.
Any ideas would be helpful, and please no snake jokes..
****I just noticed that the boot that goes from the back of the brake pedal to the firewall appear to have some leakage at the bottom of the boot.****
Any ideas would be helpful, and please no snake jokes..
****I just noticed that the boot that goes from the back of the brake pedal to the firewall appear to have some leakage at the bottom of the boot.****
Last edited by Gol10dr; 10-04-2011 at 06:43 PM. Reason: added info
10-05-2011, 08:36 AM
#4
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Join Date: 05-17-2007
Location: Orlando, Fl
Posts: 32
Maybe, the funny thing is... The "hissing" sound has went away, but it threw a engine code of P0171.. So now I'm really stumped... Because if my memory serves me correct, the is an O2 sensor code..
10-05-2011, 10:29 AM
#6
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Join Date: 06-30-2010
Location: Kannapolis NC
Posts: 25,739
Sounds like you have a broken or leaking flex pipe, they'll throw a P0171 if the oxygen sensors are reading lean due to an exhaust leak. Give this thread a read....
https://www.chevyhhr.net/forums/problems-service-repairs-42/catalytic-converter-p0171-27304/
https://www.chevyhhr.net/forums/problems-service-repairs-42/catalytic-converter-p0171-27304/
10-05-2011, 11:29 AM
#7
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Location: Alabama
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Could be dealing with 2 seperate issues. I refer to the OP's original post.
" I turned the car off and the sound slowly dissapaited" This quote sounds like a brake booster/vacuum leak not a flex pipe issue. The CEL that popped up seems to be from something else. Just my 2 cents, based on the original post.
" I turned the car off and the sound slowly dissapaited" This quote sounds like a brake booster/vacuum leak not a flex pipe issue. The CEL that popped up seems to be from something else. Just my 2 cents, based on the original post.
03-15-2012, 09:39 PM
#9
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Join Date: 01-28-2010
Location: Canton Ga.
Posts: 37
Whistle noise
I was thinking i was the only one who thought i had a brake booster leaking. The other day i noticed my brake pedal felt soft. Was going down farther
than it used to. Then i heard a whistling noise when i let off the brake. Took it to a GM dealer to make sure. Said all was fine. I know a soft pedal when i feel one. I work in a new car dealer parts dept. Not Gm. Tech thinks its leaking booster also. Anyone else had to replace a booster?
than it used to. Then i heard a whistling noise when i let off the brake. Took it to a GM dealer to make sure. Said all was fine. I know a soft pedal when i feel one. I work in a new car dealer parts dept. Not Gm. Tech thinks its leaking booster also. Anyone else had to replace a booster?
03-15-2012, 10:56 PM
#10
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Location: SE USA
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