I have a 2004 xg350l that is making a whining noise that my mechnic said was the power steering pump. I had the timing belt, serpentine P/S belt all replaced. Do you have any repair info on removing and installing a P/S pump on my vehicle?

When in Park or Neutral does the noise change if you rev the engine? Whining noise generally come from a worn bearing so there will be a few things to check.
First check the serpentine belt. A loose or worn belt will cause noise. Carefully watch the belt with the engine at idle. Does it run smoothly or 'bounce' as it spins? Bouncing could suggest the spring in the belt tensioner is worn and has started to go slack.
Stand in front of the vehicle with the hood open and carefully listen to the engine. Sometimes you can hear if it is on one side of the engine or the other.
The most likely causes of the whine will be...
Power steering pump, A/C pump, Water pump, alternator pulley, belt tensioner and it's pulley or an idler pulley.
Parts like the alternator have more than one bearing in them so that could be another area to check. If the serpentine belt is off you can spin each pulley by hand. Listen and feel for a gritty growl as it spins. Bearings in good condition are usually smooth and quite.
Try this YouTube video. **NOTE** Be VERY CAREFUL if you try the tests in the video.

https://www.youtube.com/watch?v=JRHj9_pwx7o

a whining noise sounds like a power steering pump going shut

Get your belts checked out. also have your power steering pump checked. fluid, pully, ect.

Check your transmission fluid level, as recommended in the Owner's Manual. Also, if your car is equipped with power steering, check the fluid level in the power steering reserve.

If all fluids are at recommended levels, see if you can locate the noise. If it is in the engine compartment, try to determine if the noise is coming from any of the serpentine belt pulleys.

Sometimes the bearings on air injector pumps fail in higher-mileage vehicles, first causing a "whining" noise, and ultimately resulting in the serpentine belt "chirping" or squealing on acceleration. Best you can do is make sure all fluids are at recommended levels, then try to pinpoint the source of the whining noise for further diagnosis.

Hope that's helpful!.

The lost acceleration is of major concern. Maybe you have lost your water pump. It would work great for a few miles when you start out and then gradually heat up and loose performance. The fluid would eventually boil over? Maybe a bearing on the camshaft is expressing it's discontent and causing extra load for the engine to overcome. Try to determine where the noise is coming from.
The serpentine belt connects the alternator, water pump, power steering, front timing pulley, fan, and front timing pulley. All these components generate a parasitic load on your engine. If the engine has to work harder because of increased load it could be any of these components. I'd definitely check the water pump listening for noise while running. Look for obvious things related to the belt and its' components.
Check the serpentine belt for wear. May indicate pulley misalignment or wear. There exists two idler pulleys that have small bearings that wear out and squealing noises. Check those for wobble with the tension off the belt. They are pretty cheap so replace them if any concern at all.
Power steering pumps cavitate and make a high pitch gear whining sound if fluids are low or gears warn of. Check the fluid and top off to the correct level.
Best wishes,
TF

Power steering pumps whine when they are low on fluid, or if they are goin bad. Serpentine belts also whine in cold weather or when they are goin bad. Tru spraying just a little WD40 on the belts when its running, if it goes away, you should be thinking about a new belt. If nothing changes, check the power steering fluid, if its full, take to a mechanic

check the fluid in the power steering and make sure its full of fluid. But it does sounds like you power steering pump is going bad..Good Luck!!!

Checking the level of the power steering is a good start. The pump is mechanical, driven by the serpentine belt, and cannot be turned off. Your steering may seem normal but if you let it go, low fluid can destroy the pump.

That is the power steering belt routed around pump pulley that is slipping . The power steering is located behind the steering column, replacing and re-routing the belt is not an easy repair.

If instead the whining noise comes from under the hood , that is the serpentine belt, that is easier to repair.

The serpentine belt is the most common cause for whining sound when accelerating, try to understand if noise is coming from serpentine belt.

Also check power steering belt under steering column, and also the rotor and chain, thei do not make whining noise , but can make noise when accelerating.

The belt is first suspect.