I would suggest you check the idler pully that tensions the belt that runs the AC compressor. It is very common for the bearing in those to go bad. Beyond that, inspect and correct tension on the other two belts. Verify that both the alternator and water pump turn freely prior to re-installing the belts. NOTE: the are some older Nissan cars that have that same idler pully and the price will be far less dear than what Infiniti will charge you for it.
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