when making a turn it makes a strange sound like the power stering
power stering on 2002 Cadillac DeVille
See Recalls: CERTAIN PASSENGER VEHICLES WERE BUILT WITH MISSING OR UNDER-TORQUED STEERING GEAR ATTACHMENT BOLTS. IF A BOLT IS MISSING, THE DRIVER MAY NOTICE UNEVEN STEERING RESPONSE OR UNUSUAL NOISES DURING TURNS.
First thing is to have the power steering fluid level checked and the condition of the drive belt that powers the power steering pump, You can find a Repair Shop at www.repairpal.com/directory and they can check these items for you