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When the vehicle has been driven and you cut off the engine and sit there for about 1 minute, there's a weird vibration under the dash...sounds like it's coming from the driver's side of the vehicle. There's an odd vibration under the dash that last for just a couple of seconds...as several second pause...and then another vibration. I've noticed this 3 times when I've cut the engine off and was sitting in the Armada waiting on a friend to run in a store, etc. Has anybody else experienced this?

I was thinking it might be something related to the self-leveling rear suspension but really have no idea. I dropped the Armada off for the 7500 mile service and the recall notice I received last week. I talked to the service manager and he said there are a couple of relays located under the dash and that could be the problem. They're going to check it out. I'll let you know what they find.
 

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The noise comes from the servos that close the vent ducts; it is normal. Also, if you watch the instrument cluster for a while after you turn off the key the needles on the gauges will jump. This too is normal.
 
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