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older model altima need drive belt tension adjustment at 7500 miles intervals, the new models altimas has a automatic belt tensioner.i you hear noises belt tensioner could be failing.or could have leaking coolant getting on drive belt due to water pump gasket leaking or pump leaking.or alternator power steering pump could be failing many things will cause drive belt to make high squeak noises.
If it's the water pump there should be water leaking, if it's the steering pump the noise would change as you turn the steering wheel left to right. If it's constant, it could be just old belt and bad idler and tension pully. Start buy praying a little water to the belt while the engine is running and if the noise goes away, the belt is in time to be chaged. If the noise is still there, then most likly it's the ilder bering or tension bearing. Good luck
Yes there is an "O" ring in there. However that plastc tube always breaks or cracks. You can get that tube kit from your local parts store. Remove the serpentine belt and pwr steer pump, The pump has three bolts accessed through the pwr steer pump pully you will see the holes in the pully to get to bolts DO NOT REMOVE HOSES. Now give the pump gentle persuasion uppward, but it will come, make sure the back of the pump isn't obstructed by the fuel rail you will see what I mean when you look at it. Remove all other parts in your way, hoses etc., be gental. When you remove the tubes note where each end goes the "O" rings have different colors 1 is redish orange & the other is purple this should give you an idea what goes where. Just remember to bleed coolant system of air when done. There's a metal tube in front that goes under upper motor mounts, it has bleeders at each end. Jobs not hard just requires time and patience. Oh, add a little permatex (black) around "O" rings when installing for added security, just push in firmly these are fragile. You might have to remove coolant reservoir bottle as well if it's in your way.
Just a heads up, $10 bucks will buy you a seal kit for the P.S. pump. I topped mine off for a couple months, then the oring on the high pressure line (from pump, front center) blew and dumped the reservoir in a matter of miles.
The line can be a stinker to get off, recommend driving the car for a few minutes to heat up the pump a little. Don't forget the 20MM wrench.