I already know about the extended warranty on the 2003-2007 350z radiator fans, and they have already been replaced. Coolant levels, water pump, and the driver's side radiator fan are all fine.

For some reason my passenger side radiator fan never turns on, causing the car to overheat when the A/C is on full blast. My car is currently at the dealership being "diagnosed," but they've yet to figure anything out in 6 hours.

Does anyone have any idea what could be wrong?

 

Did you have the stock fan assy swapped for another stock fan assy? If so.....go aftermarket, its only 115 shipped from amazon for the one I just got, and it fits like a glove.


Other than that, relays, fuses, wiring, are your starting points

 

Turned out to be two proprietary fuses that you can't pull and check to see if it's blown. Luckily, Nissan only charged me for one hours worth of diagnostics and the fuses. They also put in the new fans, under warranty, as one was about to fail anyways.

 

Glad you are back on the road!

 

If it was a warranty job you shouldn't of had to pay for any labor. I understand the fuses since they are wear and tear items.