We took our Murano to the dealer with the same problem.
They seemed to know what we were talking about, although this was their first time fixing it.
Took about an hour, no more cracking sound.
You shouldn't have to do this yourself.
From the service invoice-
"snap rattle noise left dash windshield area.
verified concern found cowl area rubbing on windshield.
removed cowl and insulated with foam tape.
road tested with customer noise is gone at this time."
total parts & labor 0.00
The noise was gone, but a week later,
we found the washer fluid was not working.
They had pinched the washer fluid tube
under the corner of the cowl on the passenger side during replacement.
It was about a quarter inch away from the slot it was supposed to be in.
I just pulled the plastic tab and moved the tube to the slot.
All is good, for now.
