Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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Normally that is a indication that something is in the blower motor. If you have not changed your incabin filter in a while, debris could have fallen into the blower motor area causing this noise.
To resolve it, you only need to remove the 3 screws that secures the blower motor and it's electrical plug and clean out any debris found in the blower motor and then re-install. That should resolve your issue.
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