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X1 E84 (2011 - 2015)
First generation BMW X1 availbe as a X1 28i with either sDrive (RWD) or xDrive (AWD) or the US exclusive I6 N55 powered X1 35i xDrive.

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Old 07-06-2013, 08:14 PM
lgcphoto lgcphoto is offline
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2013 X1 - Hissing sound with engine off


We just got back from our first long road trip with our 2013 BMW X1. The weather was hot and the A/C on auto running the entire time. We've had the engine off for about 3 hours now and this whole time it's been making a hissing sound that happens every 18 seconds and lasts for about 1 second each time. Any thoughts whether this is normal or if it indicates a problem? I'm guessing it's somehow related to the A/C, but that seems to be operating normally (so far)...
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Old 07-06-2013, 10:19 PM
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stonex1 stonex1 is offline
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I'm no expert, but it doesn't sound all that bad since you've narrowed it down to a timing.
Perhaps that's normal.
But again, I've never heard of such a thing where a vehicle makes a sound like that.

So this is weird.
2013 X1

Last edited by stonex1; 07-06-2013 at 10:21 PM.
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