Most power window problem on 124 300E is the window switch I will check the switch first........an other thing you can do is to use key to lock your vehicle from door lock and hold the key at lock position for 5 sec the convenience system will raise all windows this is easy way to test your window motors. ( if your vehicle has convenience system )
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MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner
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