If you don't have a Factory Service Manual, GET ONE!
You can download one for free at http://www.nicoclub.com , ask in the Pathfinder forum and one of the Moderators will access it for you.
Good to have on hand while you're wrenching - You CAN DO IT!!!How do you change the water pump on a 02 Pathfinder?i think that 02 can be a 3.5 or a 3.3 v6 the 3.5 has a access panel on the timing case which you have to compress the chain tensioner to get slack on the water pump side... the 3.3 is more involved you have to remove drive belts,timing belt cover , crankshaft pulley and radiator shroud to access the water pump
