I have a 94 Deville 4.9 and power steering quit working while we were in shopping. Worked fine when I parked it. Came out of the store, Started the car and went to drive away. Power steering went out. I cant find were its leaking at. I added fluid. Won't work, can't find a leak and no puddle on the ground. I have been driving it like that for the last 2 days. Can someone enlighting me on power steering problems. It has a new pump as of last year. Thanks for Your help.

Thanks
Jim

 

Pump or steering gear, Take cap off pump observe fluid level when steering wheel is turned. If fluid level changes momentarily I would suspect gear is leaking internally. If no change in fluid level suspect pump.