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Discussion Starter · #1 ·
2016 passenger.

after turning off the car, I get this low volume but solid thud/thump sound from the front dash region that is about once every 5-6 seconds. It’s always a single thud at a time and seems to last for 5 to 10 minutes.
Any ideas??

you can hear at 0:10 and :18 in this video if you turn up the volume.
 

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I believe the Metris always reverts back to vented fresh air in as apposed to recycled air when shut down. That sound would be forward center of dash. Perhaps that damper is slipping a gear. Just a guess; there are way more knowledgeable here.
 
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