Do I check the PAS Fluid Level for the steering on my 2002 ML270Cdi--- As usual the handbook mentions nothing other than - go to your stealer and pay him lots...
there should be a fairly obvious 'pot' anout the size of a tin of beans, with a cap... open cap, should have very short dipstick on it with usual markings (hi/lo hot cold)
pot should have largeish thick rubber pipes (3/4" ish diameter) going to it. At front of engine, with or very very close to the PAS pump.