The popping on a sharp turn is your steering stop hitting the rub plate. The plastic cap is probably work through. Mine does it too. It can be greased if the noise bothers you.
Which Fan? My 2000 has the main radiator cooling fan, and also the idle auxiliary fan. The aux fan I don't think even works, and I may rip it off the next time I remove the grille.
The main cooling fan attache to the water pump housing, well, that's pretty important. Check your temps are OK. Are you sure it is the fan, and no a loose air box cover or something else? Fans can go out. At 107K, what you REALLY need to know is if the timing belt has been changed. If not, get it done ASAP. They'll find any problems with the cooling fan or clutch while doing that. It may be a little costly, but you're good for another 105K miles when it is done.
2000 XE V6 4X4 5speed, AC shackles and UCAs, Bilstein 4600, K&N drop-in, intake mod, AC Idler brace, Yakima kayak rack, Shrockworks Skids, custom sliders, BFG AT/KO 32x11.5x15, custom rear bumper/swingout tire carrier, custom front tube bumper.