On my 2001 XL, the power steering seems to be going out but ONLY on right hand turns....left turns are fine. It is intermitent and very hard to steer even on the freeway at 75MPH ......dangerous also. There is also a 'hissing' noise coming from the firewall when it does become hard to steer. Couls it be ther gear box, PS pump or other. I'm lost on this one.
:banghead:

P/S pump has no idea if you are turning right or left. The gear box is the most likely culprit.

//2000CAYukon