I took the truck in for a oil change, dealer suggested to replace belts to get rid of squeak, did not help. They replaced belt pully, did not help. They suggested to replace alternator...I took it into a local shop that rebuilds alternator, they put in new bearings and brushes, but they said they weren't bad, but since they had it apart they changed them.
Loosen the belts [ you do not need to remove] so they are free of tension to all pulleys.Start engine , if noise goes away either belts were too loose [ common on lx 450] or you have a worn & noisey pulley /bearing.have seen idler pulley below alternator have dry / noisey bearing.Otherwise if idler is ok it has to be another belt driven assessory , ac clutch,water pump & or fan clutch.Good Luck.
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The only cure to fix squeaking belts, is to replace with the new one. When the belts start squeaking noise, then it is the time to check the status of the timing belt or chain, depending on the size of the engine. The 2000-2004 Nissan Xterra was offered with the choice of 2.4L 4-cylinder or 3.3L V6 engine. The 2.4-liter 4-cylinder DOHC engine was a pretty good reliable engine, but for this truck, it was underpowered. This engine has a long-lasting timing chain - there is no timing belt to replace. The 3.3-liter V6 SOHC was also a bit slow on pick-up, but for daily use, it was pretty good, durable, simple engine. This engine has a timing belt that needs to be replaced at recommended intervals. The SE model offered a supercharged version of the same engine with more power. To get more information, please read my tip : When should I change the timing belt on my car? http://www.fixya.com/cars/r6481199-when_change_timing_belt_car
As you probably know squeaking could be alot of things, but the most common noise, that would not effect performance, would be serpentine belts. You can buy a can of belt dressing at Autozone, that you spray on the inside, the contact side, of the belt. If it is the belt, this should help. If it's been a long time since replaced you may want to replace belt. Alot of those belts will break after being worn out, but the better quality belts may not break, but they will make a horrendous squealing noise. If it's not the belt, you'd have to have someone look at it to troubleshoot. Good luck.
duse the howl go away when you trun a conner ?if it duse its a wheel bearn. as for the squeak its hard to pin point. try finding some one how duse mud run they would be ableto help you with the howl noise. have a nice day
U replace the tensioner or any belt run pulley only if the pulley has excessive wear or the pulley bearing has noise or excessive side to side movement, if the belt is squeaking and the pulleys it runs over are ok and don't have any of the above problems replace the belt, they should be replaced every 60,000 miles are sooner in dusty enviorments like dirt roads.