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I noticed that in the engine bay at the top of the firewall there are some ventilation flaps (center) and if stiff leaves or twigs get in that area or even down at the base of the windshield wipers or under the cladding for brake reservoir or electrical terminal for jump start - that the noise can seem to be inside the dash.
I use the vacuum and blower modes of a wet/dry vac to keep the area clean and dry after a wash.
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