After a cold start and within a hundred yards or so if I make a left turn the steering won't let me turn to the right. (It feels like I have no power steering) I can force a turn with GREAT effort. However if I turn the steering wheel left again I can turn right normally. This was a nuisance at the very least but now it has happened on the highway and caused the truck to cross the center line into the opposing traffic! What's going on? Thanks for your help!

 

Check rack lines, PS pump and resevoir. Somethings blown

 

Sounds like a bad pump