I just bought a restoration project, and I'm having trouble diagnosing a problem with the car. It's a 1963 1/2 Ford Galaxie with a 289. It has power steering, which works, but only when you turn the wheel left. If you turn it right, there is no power steering. This is the case at idle, as well as while driving. I have made sure that the fluid is full, and it doesn't make any concerning noises or seem to leak.
I'm not very experienced with power steering setups in general, and even less so with this car. What is a likely culprit to cause such behavior? I would expect it to either work or not. What would cause it to only work in one direction?