I have a 2003 Sonata GLS which has the moon roof with the shield. When
it rains, if you have any window open slightly you will hear a tapping
sound. I tried removing the shield on top which minimized the noise,
but did not totally eliminate it. Two dealers have looked at me
puzzled. I guess I need to go there in the rain. Anyone have a similar
problem?

 

I have a 2002 Sonata with a moon roof and shield and it does exactly the
same thing, but only when it rains. After it has been driven awhile and
the water has been evaporated the sound disappears. I have not been able
to figure it out either.