High pitched whining noise transmission or steering?

[e30cabrio]

We are at a hotel in downtown San Diego with valet parking. When they brought my X down this morning there was a disconcerting noise I had not previously heard.

It sounded like when the PS fluid is low and the wheel is turned on an old car. I rolled down the windows and listened for it, it did not happen again.

I swapped the PS fluid with Redline when I got the truck. Any input is appreciated.

[DillonInCO]

When does it happen? RPM, throttle position? When you turn the wheel or all the time?

[e30cabrio]

It has not happened when I am driving. It was coming down a corkscrew type driveway from an indoors parking structure in the US Grant downtown San Diego hotel. It was going 5 or so MPH and turning hard left. I listened for the sound when we drove out and nothing and again after it had sat for several hours when we left where we went.

Thanks

[e30cabrio]

The answer is neither. It was the fan shroud attached to the fan and eaten by it.

New shroud ordered.