It could be the thermostat or the fan clutch, a clogged-up radiator, many things can cause a vehicle to overheat.
The thermostat is located on the front of the engine in the center, under the belts, etc.
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'88 Pathfinder: 6" of lift, 33x13.50 Swamper LTB's, Rancho 9000's, L&P Stage 3 steering system, K&N, Pacesetter headers and 2.5" exhaust, Lock-Right locker, 110A alty and electric fan swap, dual batteries, 700W+ worth of PIAAs, etc.
Yeah, there are both the Haynes and Chilton manuals available for the model years that include the 98 Pathfinder. I bought the Haynes and it seems to be pretty good. It is a little more focused on the 2.4L and 3.5L engines that came out during those years, but it is still pretty good. It is my understanding from reading a post a number of weeks ago that the Haynes and Chilton manuals are exactly the same now as Haynes bought out Chilton a couple of years ago. I got mine off Barnes and Noble for $22. Good luck!
Whoops, I misread that to say "1988", not "1998". I don't know where your thermostat is for that particular vehicle.
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Admin of NPORA, mod for Nissan-Infiniti Forums, NissanForums.com, NissanHelp.com, AllNissans.com and VGPowered Forums
'88 Pathfinder: 6" of lift, 33x13.50 Swamper LTB's, Rancho 9000's, L&P Stage 3 steering system, K&N, Pacesetter headers and 2.5" exhaust, Lock-Right locker, 110A alty and electric fan swap, dual batteries, 700W+ worth of PIAAs, etc.
Look for the lower Rad hose, follow it up toward the engine, it will go into a steel pipe that is a few inches long, then turn rubber again, at the end of it is the T-stat housing. but they usually don't go bad that often unless it was replaced with an aftermarket one. odds are you have a coolant leak somewhere.