Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Changing the alternator on this engine is a bear. You can leave the AC compressor lines connected and wiggle the alternator out without losing any freon, but it's not easy. I'm not sure why they designed it that way, but it's impossible the remove the alternator with the AC compressor bolted on. I assume you have this diagram:
This guy does it by moving the AC compressor out of the way on an older model than yours, but it's the same exact set up:
This guy shows how he pulled it out the top by removing the radiator hoses, fan shroud, and fans. It's in spanish, but you get the idea. Basically what he says is that it can be done without removing the compressor, but he had to unplug the connector from the top of the compressor to give enough space. I think it would be easier if you just unbolt the compressor and move it out of the way as far as you can like the first guy did.