You can pull the knee bolster off, the panel just under the steering column, get a light and look around, or pull out the I/P cluster and see if you can find something that is obviously not attached. It could be a loose harness that popped out of the retainer and is easy to spot.
However, I would demand that the dealer fix the problem. They should have a set of chassis ears, that they can use to help pinpoint the rattle.
I should mention the cluster and the knee bolster are easy to remove. PM me if you need any procedures for the I/P.
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Black Sheep Hummer Squadron
(ME TOO)
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