See NTB08-053b, dated March 23, 2009. IIRC, there is a copy on this site.
Quote:
A tapping noise coming from the dash area when the engine is running at operating temperature,
NOTE: This tapping noise, if it should occur, sounds like a screwdriver being tapped on the work bench. The tapping speed increases and decrease with the engine RPM and may require engine RPM of about 3000 for the noise to be heard.
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ACTION
“Back-Flush” the heater core to remove gray silicone debris.
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