I am going to bring this up again because there is no info about someone doing the actual install
I finally got my heater and cord from the dealer. I believe I found the plug to pull out behind the alternator. It is located on the passenger side and only accessible from underneath or maybe pull the wheel well liner.
I am wondering for people who have done this, is it a 12mm hex socket? Did you pull the liner or just remove skid plates and come up from the bottom?
i just bought my block heater today, there is a frost plug right by the starter motor, you have to drain the coolant, from the block and the rad, pull the frost plug, install the heater make sure you have the washer/gasket that comes with it on. tighten it in, take the proper steps to refill your cooling system and off you go
i got mine from a place called "part stop", near where i live, but i assume any nissan dealer should be able to get one in for you, worst case you can always get a magnetic oil pan heater, not quite the same but does a failry good job form what i'm told
Different angle of Block Heater location on right bank in attached photo. I got my parts through Nissan. I could not find a jobber part. Just be careful routing your cord to prevent contact with the manifold or moving parts.