ok guys...I have notice that my radiator fan is not working recently. so I wanna start checking for any problems. I want to start with the radiator relays in the relay box in front of the battery. How do you test these thing so tsee if they are working or not? cause I noticed that "rad fan 1" relay is not the factory one. so I wonder if that's the problem or not.
any help on this is appreciated.

 

ohh c'mon guys I know someone knows how to test a relay!!!

 

Get a 9 volt battery and a couple of jumper wires.
Connect the + side to one side of the coil, and the - to the other. You should be able to see a drawing on the relay itself. 2 of the pins are for the normally open switch. Don't connect to those. And don't hold the voltage there for too long; just long enough to hear it click.

 

what does NORMALLY OPEN SWITCH means?

 

If you don't understand the wiring, I recommend just yanking the relay out and taking it to your nissan dealer or radio shack and asking if they can check it. most car stereo shops will do this too, if they're not busy.