Its hard to tell for sure with the amount of other noises going on in the clip but I would say that glamisdude was right in his guess. I did my belt and tensioner the other weekend and it was pretty easy. Its also probably the cheapest option to start with. I paid $70 at O'Reilly's for the belt and tensioner made by Gates. I chose to go with aftermarket parts on purpose since the OEM tensioners are known to go out prematurely. I have no idea if the aftermarket replacements are any better but I figured it was worth a try.
The replacement was easy.
1. Make sure you have a 14mm ratcheting combination wrench and a non-ratcheting 15mm combination wrench.
2. Disconnect the negative battery cable (you'll be working with your hands touching the fan, saving your stored stations on your radio is not worth it).
3. Stick a ratchet in the square hole in the front of the tensioner and rotate the tensioner counter-clockwise to release tension.
4. While holding the tensioner in this position, slide the belt off of the idler pulley (make sure you take it off the idler pulley and not the tensioner first, trust me).
5. Remove the belt from the rest of the pulleys.
6. Now grab the wrenches I told you to get in step 1. If you skipped step 1, go get yourself a beer because you'll need it in a minute.
7. Place the box end of your 14mm wrench on the tensioner bolt with the handle and the open end facing up. Hook the box end of your 15mm wrench on the open end of your 14mm wrench for extra leverage and even more importantly, to keep your hands away from the sharp fan blades that will cut the hell out of you. See the bottom of this post if you have no idea what I'm talking about with the 2 wrenches. Now break the bolt loose.
8. If you skipped step 1, open the beer you got in step 6. You'll need it in a second.
9. Use the ratcheting 14mm wrench I told you to get to get the bolt the rest of the way out. I found the best way was to hold the wrench to the left side of the radiator. If you didn't get a ratcheting wrench this bolt will seem like it is never going to come all the way out as you continue to slice your hands and or arms on the fan blades and probably drop your wrench multiple times. Apply the treatment you got in step 6 as needed. (Note: this treatment should be administered orally, not topically.)
10. Repeat steps in reverse to reassemble.
This should give you an idea what I'm talking about with the 2 wrenches. I just got this picture online, its obviously not from this job.
2005 Nissan Frontier SE
or 
Linear Mode
