Buy OEM 2009 Cadillac Part # 26016820. Power Steering Reservoir. 1987-89, 2.8, 3.1 liter, from VIN 500001. 1990-96, 3.1 liter. 2.8 LITER, type 2. 3.1 LITER. POWER STEERING, 3.1

Power Steering Reservoir.
Power Steering Reservoir. Type 1 is VIN to 500,000. Type 2 is VIN from 500,001.

Power Steering Reservoir

Fits Beretta, Cavalier, Corsica

1987-89, 2.8, 3.1 liter, from VIN 500001. 1990-96, 3.1 liter. 2.8 LITER, type 2. 3.1 LITER. POWER STEERING, 3.1 liter.
Power Steering Pump Reservoir - Repair or Replace
If the steering in your 2009 Cadillac whines or groans, or if your steering wheel is hard to turn, you may have a failed power steering pump.