It's basically under the steering column. If you lay on the floor and look up you should be able to see it using a flashlight. It's a black plastic box like shape and it slides onto a metal mounting bracket. If you want the original Nissan part, it's $73, you can get a generic for $10 but it doesn't mount back on the slide and just hangs there unless you use electrical tape or something else to attach it.
The thermostat on a 2001 Nissan xterra is located next to the bottom radiator hose.
The 2001 Nissan Xterra has 16 valves.
The 2001 Nissan Xterra is a gas-powered vehicle.
The 2001 Nissan Xterra has an inline 4 engine.
The 2001 Nissan Xterra has a 5-speed manual.
Directly on the bottom of the motor.
The height of the 2001 Nissan Xterra is 6 ft. 2 in. (74 in.).
The 2001 Nissan Xterra has double overhead cam (DOHC).
The 2001 Nissan Xterra runs on regular unleaded.
The 2001 Nissan Xterra is 14 ft. 10 in. (178 in.) long.
The 2001 Nissan Xterra has 37.8 in. of rear head room.
The 2001 Nissan Xterra has 38.6 in. of front head room.