How to Diagnose Issues with the Mercedes Benz C230 Window Regulator
You're driving down the highway and you suddenly want to turn off your air conditioning and enjoy the nice warm breeze. You reach for your power window switch, expecting wind to enter your cabin. It does not, and you flip the switch over and over without a response. Your Mercedes Benz C230 window regulator might have failed, causing your window to freeze in the last position it is in. Listed below are some of the most common problems with window regulators and how to properly diagnose what's causing them.
Presence of motor noises
The first step to take when diagnosing a problem with car windows failing to roll up or down is to determine whether the problem is mechanical or electrical. If you press the power window switch and don't hear any motor sounds, the problem might be electrical-it may be a broken switch, a blown fuse, or a busted motor. However, if you hear motor noises but the window does not roll up or down, it might be a problem with the window regulator.
Check if the drive rollers are broken. They usually are the culprit behind failing window regulators. Fortunately, they are less expensive than the window motor to replace.
Slow window movement
Most power windows have a cable or plastic strap that makes the glass roll up and down. Constant pressure applied to the cable or strap can eventually cause it to weaken or even break. Check for dirt accumulated in the regulator and the tracks. This will require you to use more force when rolling the window up or down. Note that the driver's side window is the most used window in a car, so its regulator is almost always the first one to break.
Window that does not go all the way up
When the window stops at a certain position, it might be time to remove the door panel and check if the window regulator has gone off-kilter. Check if all the gears are set properly in place and if they are clear of any dirt or other substances. Inspect the regulator itself. Make sure that it is attached properly to the door shell with rivets.