I have a 1990 190e 6cyl. I noticed that the steering wheel is squeaking and is a little difficult to turn. I do not know if the car has power steering. I checked the owner's manual and did not find it. I also looked under the hood and I could not find a resivouir for fluid.

 

USUALLY DOES HAVE APS. HAVE YOU CHEAKED THE TRANSMISSION FLUID? SITUATED AT THE RIGHT FRONT, METAL LOOKING RESIVOIR WITH BLACK SCREW ON TOP. THIS HAS HAPPENED TO ME AND IT IS USUALLY THAT IT NEEDS A TOP UP.
HOPE THIS HELPS!