Hissing/leaking sound after car turns off

MrHarris · 07-20-2009, 04:50 AM

I heard a type of hissing or leaking sound twice today right after I shut off my car.

It was coming by the front wheels/engine and it was a periodic hissing sound. Almost sounded like a blow off valve from a turbo car just more mild.

I've never heard this sound before. It was about 85 degrees outside. Anyone got any ideas what this could be? Could it be something that has to do with the air conditioner? I'm hoping this is normal!

zenderm3 · 07-20-2009, 04:52 AM

Doesn't sound normal... but could have something to do with the a/c.

gadget · 07-20-2009, 05:36 AM

I've been getting the same sound lately. I sounds like a liquid hitting a hot pipe.

I thinks its just the AC but am worried it could be something else since I just recently began to happen and haven't read about other complaining about it...

foosh · 07-20-2009, 06:25 AM

NORMAL.

There was a thread about it here just the other day (search "sizzling sound"). It's condensation from the a/c dripping on the hot exhaust manifold.

M3ltdown · 07-20-2009, 06:31 AM

yeah... been hearing it too. Makes me want to fry up some eggs and bacon

RJD M3 · 07-20-2009, 06:36 AM

Here too...love the Humidity in the South :/

Mischievous M · 07-20-2009, 07:00 AM

Yup... the hissing sound is fairly normal. I was comforted by my service manager and head mechanic that its not a big drama to worry about.

enfield · 07-20-2009, 07:08 AM

I agree with the above. The noise is normal and is due to the a/c water hitting the exhaust.

05SCM33 · 07-20-2009, 08:07 PM

I don't know about this guys. My friend's cousin had a neighbor who was visiting his brother that told him about hearing that hissing sound on his new M3 right before his engine seized and threw a rod.

If I were you, I would leave your AC off just in case.

Finnegan · 07-20-2009, 08:09 PM

Quote:

Originally Posted by 05SCM3

I don't know about this guys. My friend's cousin had a neighbor who was visiting his brother that told him about hearing that hissing sound on his new M3 right before his engine seized and threw a rod.

If I were you, I would leave your AC off just in case.

BMWM.D. · 07-21-2009, 12:34 AM

Yep, its water from the evaporator housing draining out and hitting hot exhaust. Noticed it on my car the other day, totally normal.

spyderco10 · 07-21-2009, 01:57 AM

I'm amazed there are still new posts about this. This has been discussed many many times before. This and the ticking noise from the clutch....

foosh · 07-21-2009, 07:18 AM

There should be nothing amazing about it.

New people show up every day, and when you experience a new symptom for the first time, you're worried. It's difficult to know what "key words" to use in a search on a forum like this, and the search function usually requires wading through a bunch of non-applicable stuff. If you find what you're looking for, you're lucky, but more often than not, you don't.

KiokenM3 · 07-21-2009, 08:51 AM

mine does this

07-20-2009, 04:50 AM	#1
MrHarris yodog 197 Rep 5,025 Posts Drives: '86 Corolla Join Date: Jun 2007 Location: Diamond Bar, Ca iTrader: (5) Garage List 2009 BMW [10.00]	Hissing/leaking sound after car turns off I heard a type of hissing or leaking sound twice today right after I shut off my car. It was coming by the front wheels/engine and it was a periodic hissing sound. Almost sounded like a blow off valve from a turbo car just more mild. I've never heard this sound before. It was about 85 degrees outside. Anyone got any ideas what this could be? Could it be something that has to do with the air conditioner? I'm hoping this is normal! __________________ 2009 E92 M3 \| Alpine White \| Black Extended \| Advan RS \| Turner Test Pipes \| Dinan Axle-Back \| OETuning \| Eibach Springs \| UUC SSK \| VRS Front Lip \| VRS Type I Diffuser \| Matte Black \| RPi Scoops \| MS Filter \| Yokohama AD08 \| F1 Pinnacle Special Thanks: Gintani \| OETuning \| eAs
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07-20-2009, 04:52 AM	#2
zenderm3 Lieutenant Colonel 95 Rep 1,996 Posts Drives: E36 M3 DY/2010 E92 M3 Join Date: Jun 2009 Location: Brisbane iTrader: (0)	Doesn't sound normal... but could have something to do with the a/c. __________________ ________________ My ///M is in my garage .... and it is a beast! 2010 E92 M3 Space Grey \| Fully Loaded 1996 E36 M3 Dakar Yellow - SOLD 2004 Honda Accord Euro - SOLD
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07-20-2009, 05:36 AM	#3
gadget Major 108 Rep 1,161 Posts Drives: 09 e92///M SSII DCT Join Date: Nov 2007 Location: US iTrader: (0)	I've been getting the same sound lately. I sounds like a liquid hitting a hot pipe. I thinks its just the AC but am worried it could be something else since I just recently began to happen and haven't read about other complaining about it...
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07-20-2009, 06:25 AM	#4
foosh Major 27 Rep 1,314 Posts Drives: 2008 M3 E93 Join Date: Mar 2009 Location: Annapolis, MD iTrader: (0)	NORMAL. There was a thread about it here just the other day (search "sizzling sound"). It's condensation from the a/c dripping on the hot exhaust manifold. __________________
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07-20-2009, 06:31 AM	#5
M3ltdown Master Chief 19 Rep 641 Posts Drives: 09 e90 M3 JzB Join Date: Jul 2008 Location: NOVA iTrader: (0)	yeah... been hearing it too. Makes me want to fry up some eggs and bacon
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07-20-2009, 06:36 AM	#6
RJD M3 Private First Class 18 Rep 192 Posts Drives: E90 M3 Join Date: Mar 2009 Location: Dover, DE iTrader: (2)	Here too...love the Humidity in the South :/ __________________ 2009 Jet Black E90 ///M3/Black Leather/Carbon Leather/M-DCT/Tech/Premium/Premium Sound/ Heated Fronts/Moon/19's/Eisenmann Race w/ Connecting Pipes/Matte Grills/Painted Reflectors/Euro LCI Tails/20% Tint C-17A Globemaster III
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07-20-2009, 07:00 AM	#7
Mischievous M First Lieutenant 34 Rep 330 Posts Drives: BMW (E92) M3 & 2004 JCW MCS Join Date: Oct 2008 Location: Brunei Darussalam iTrader: (0) Garage List 2008 BMW M3 (E92) [0.00] 2006 Touareg V6 3.2L [0.00] 2004 Mini Cooper S ... [0.00]	Yup... the hissing sound is fairly normal. I was comforted by my service manager and head mechanic that its not a big drama to worry about. __________________ Warm Regards, Mischievous M No Replacement For Big Displacement!
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07-20-2009, 07:08 AM	#8
enfield Civilian 79 Rep 970 Posts Drives: Jaguar F-Type V8 S Join Date: May 2007 Location: Ontario iTrader: (0)	I agree with the above. The noise is normal and is due to the a/c water hitting the exhaust.
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07-20-2009, 08:07 PM	#9
05SCM33 First Lieutenant 30 Rep 385 Posts Drives: 09 E92 M3 Join Date: Feb 2008 Location: Arizona iTrader: (4)	I don't know about this guys. My friend's cousin had a neighbor who was visiting his brother that told him about hearing that hissing sound on his new M3 right before his engine seized and threw a rod. If I were you, I would leave your AC off just in case.
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07-21-2009, 12:34 AM	#11
BMWM.D. Stupid Idiot 134 Rep 827 Posts Drives: E90 335i & 6th Gen ZL1 Join Date: May 2009 Location: Santa Barbara iTrader: (1)	Yep, its water from the evaporator housing draining out and hitting hot exhaust. Noticed it on my car the other day, totally normal. __________________
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07-21-2009, 01:57 AM	#12
spyderco10 Colonel 63 Rep 2,426 Posts Drives: AW E92 M3 6MT Join Date: Jul 2008 Location: Honolulu, HI iTrader: (0)	I'm amazed there are still new posts about this. This has been discussed many many times before. This and the ticking noise from the clutch.... __________________ “For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.” - John 3:16
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07-21-2009, 07:18 AM	#13
foosh Major 27 Rep 1,314 Posts Drives: 2008 M3 E93 Join Date: Mar 2009 Location: Annapolis, MD iTrader: (0)	There should be nothing amazing about it. New people show up every day, and when you experience a new symptom for the first time, you're worried. It's difficult to know what "key words" to use in a search on a forum like this, and the search function usually requires wading through a bunch of non-applicable stuff. If you find what you're looking for, you're lucky, but more often than not, you don't. __________________
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07-21-2009, 08:51 AM	#14
KiokenM3 Lieutenant Colonel 84 Rep 1,504 Posts Drives: LIFTED JEEP JK! Join Date: Dec 2008 Location: LA iTrader: (4)	mine does this
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