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Discussion Starter #1
So, the GLA makes a high-pitched whine-whistle after it's been turned off sitting in the garage. Seems like it might stop after 30mins or so, is it a fan running? Hot here right now, in the 90's.
 

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Modern cars are full of fans and ducts. It is not uncommon to hear motors whirl and fans to operate as your car cools down.
 

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Both my GLA and Audi TTS make sounds after shutdown. Sometimes it’s the fans, and/or turbo depressurizing, and/or catalytic converter dissimilar metal cooling. As Wayne cites there’s all sorts of stuff auto-happening especially on modern turbocharged vehicles. And yes it’s very ambient hot here too right now,
So, in my examples a whir, a whine and a bang. ;)
 
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