Yesterday, I was doing a few spot checks on hardware under the hood. I checked the radiator shroud for looseness and tightened the lower fasteners.
Today I started the car and immediately heard what sounded like a knocking/tapping noise.
I couldn't readily determine the source. I started with the water pump, thinking it was making the noise. I removed the fan belt and manually spun the the fan assembly. I could hear a wrapping/tapping type noise. The water pump shaft did not wiggle/move latterly so pump seemed ok. But one of the fan blads had interference with the lower radiator shroud. So I ground down that spot and the noise stopped.
