Have you checked the fluid? Has it been run low on fluid in the past? Check for leaks in the fluid return lines, you could be sucking air into the system. Is the fluid milky or foamy? milky would be an indication of moisture and foamy would indicate the air leak.
I also have a 1993 Cadillac DeVille and smoke is coming out of the steering wheel. wish I had an answer.
Could be a problem inside the steering column
You will need to have the codes checked for your steering system but most of the time the problem is a bad steering position sensor which is located at the bottom of the steering column on the inside of the car. I have seen defective YAW Rate sensors cause this problem but very very rare.
either the hose is split or the resivoir is cracked either the hose is split or the resivoir is cracked
If the squeeling is coming from the tires, then the problem is most likely a misaligned front end. If the squealing is coming from the engine, then the problem would be in the power steering system.
It indicates a problem with your power steering system. Could be as simple as low power steering fluid level.
Smoke coming out of steering box usually means the fluid is burned. It can also mean that the steering gear is failing.
It is not supposed to be on when engine is running unless there is a problem.
try fuelpressure regulator
change the cabin filters
an ostrich
Perhaps problem in the steering column switch?