1. Park the vehicle on a level surface and turn off the engine.
2. Open the hood of the vehicle.
3. Locate the power steering fluid reservoir. On a 2003 Mercedes ML350, it's typically labeled "Servo Fluid" or "Hydraulic Oil." It's usually made of clear plastic and located on the passenger side of the engine compartment, near the firewall.
4. The reservoir will have two marks, "Min" and "Max," indicating the ideal fluid levels. Ensure the fluid level is between these marks.
5. If the fluid is low, add some hydraulic oil specifically formulated for power steering systems to the reservoir until it reaches the "Max" mark.
NOTE: Always refer to the owner's manual for the specific instructions related to checking the power steering fluid on a 2003 Mercedes ML350. The information here is general and may differ based on variations in trim levels or specific model configurations.
