I have 03 s type 3.0 with ever popular steering wheel squeak. I have read the TSB that says remove 50 cc's of power steering fluid and pour in additive, heat it up etc.

My local mechanic at jag dealer says instead I should remove resevoir, pour in additive then refill with new fluid. No mention of heating and the rest of the items in TSB.

Any ideas on which of these will work better?

 

What we all need to know is: Are you talking about those pesky moans that power steering pumps love to make? Or, is it the squeek that happens when you turn the steering wheel. The steering wheel squeek comes from carbon brushes dragging on the circular rings of copper that transfer the circuits from the steering wheel to things like the horn, cruise control, etc. PS fluid additives will get into the mix fast as there is a continual flow. It will be hot after a drive and turning the wheel lock to lock a few times will distribute the stuff.

In the past, I tried several things to try and get rid of the squeek and those pesky fairies sneak in, in the night and put them back.

 

it is the sound when the steering wheel is turned at low speeds

 

I should have added that it doesn't hurt to change the PS fluid. Opening up a conection at a low piont and letting it drain will be enough.

Here is why we get the moan. PS pumps are usually vane pumps. Cheap and easy to make. You have a rotor with slots. Into the slots go the vanes. When the pump starts spinning, centrifugal force throws the vanes out against the chamber. As pressure builds when you use the steering the vanes get fluid coming in on the front side and pushing the vanes up and back. The trailing edge of the slot starts wearing backwards and the chamber gets a depression at the smallest area side of the chamber. This makes it harder for the vanes to move and they vibrate like fingernails on the chalkboard. The pressure relief valves can also sing for you too.

In the long run, it takes a new pump to finally fix the noise.

 

In most reports that I've read people using the Jag magic juice follow the TSB procedure, I don't see any harm in removing more fluid and replacing with new, but if it were me I'd follow the heat up procedure.
The success rate also seems to be high.