Two problems related to power steering pump have been reported for the 1999 Cadillac Deville. The most recently reported issues are listed below.
Power steering failure as reported in thetsb reports 619249-619248-619410.
I own 2 1999 Cadillac Deville's. One in NY & one in FL. Both vehicles had the exact same problem. The power steering pump had to be replaced in both cars because of a grinding and difficulty in steering. This seems to be due to a defect that should have been recalled by general motors, and I should be reimbursed my cost of about $1000. For both repairs.