I have a 2004 Nissan Quest, recently when we start the van there is a knocking noice whcih seems like it is coming from the dash, it goes away after a few minutes and never returns. It only happens when we start the van. The fans are not on, but it did start sometimes when we put the fan on in the van.
I had a similar knock. It turned out to be the Hood Support rod, not on bracket but hanging down in the engine bay.
Just an idea.
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