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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 10-12-2005, 08:15 PM   #1 (permalink)
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What's that noise???

OK guys, I'm really starting to think this car is possessed . After driving the car today, I parked in my garage just like always. I was looking through my toolbox and suddenly there was this very strange noise coming from the car. It sounds like a loud hissing/whistle. It kinda sounds like someone letting the air out of a tire or maybe a balloon. It lasted maybe 7 or 8 seconds then it stopped. I thought maybe it was a tire but they were all ok. I've heard this a couple of times before after driving but never really paid attention to it until now. I guess it sounded louder inside the quiet garage. All seems well with the car, I drive it 60 miles every day with no issues. What could making this noise? If it helps it seems to happen a few minutes after shutting off the engine. What do you guys think??
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Old 10-12-2005, 09:21 PM   #2 (permalink)
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Where is the sound coming from?... that might help us help you.

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Old 10-13-2005, 02:12 AM   #3 (permalink)
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mine makes a few noises as soon as i turn it off, with the air con and god knws wht but i never really hang around for 15min afta i do it heh
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Old 10-14-2005, 08:48 PM   #4 (permalink)
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Probably just pressure being relieved from the fuel tank
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Old 10-14-2005, 08:57 PM   #5 (permalink)
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It's mroe than likely your air conditioner. I believe ALL BMW's do this. It's going through a process of shutting down the air conditioning unit, or some gibberish like that. Im almost sure it's this. Whenever I parked ina agarage it seemed almost too loud aswell. Next time you turn off your car notice that it is coming from your front vents.
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Old 10-14-2005, 09:13 PM   #6 (permalink)
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maybe its a snake stuck in ur car, but yea it could be the A/C my car does this as well...
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Old 10-15-2005, 09:03 AM   #7 (permalink)
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It is probably normal cool down noise. If the hissing is short like you say, it's probably normal activity. My car does this as well. As long as it isn't coming from a tire or is prolonged (i.e. for a minute instead of 10 seconds), it's probably just your car letting air out. You know. That contented sigh of a good drive.
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Old 10-15-2005, 04:56 PM   #8 (permalink)
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Thanks to all that responded. I just moved the car from one side of my garage to the other to change oil and guess what?... it did it again. Since none of you think it's a big deal I just won't worry about it anymore. I'll just go with the response from 4evrwyntr. "Contented sigh from a good drive". That's what I'll call it from now on :lol: Thanks again, I'm sure I'll have plenty of questions down the road but for now at 173K, all is well.
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