The high-pressure power steering lines are known to leak.
Car Problem Reports
Cadillac DeVille High Pressure Power Steering Hose Can Leak Fluid
Cadillac DeVille Problem
Average Mileage: 149,228 mi (130,000 mi - 168,456 mi)
Visitor, 1998 Cadillac DeVille, 130,000 mi
power steerig fluid leak
line disconnected, replaced upper high-pressure and also low-pressure line, as recommended, very expensive