* Broken Window Regulator: This is the most common culprit. The regulator is the system of cables, tracks, and rollers that actually moves the window. A broken cable, a slipped roller, or a damaged track will prevent the window from moving even if the motor is functioning. This often requires replacement of the entire regulator.
* Binding Window: Something might be obstructing the window's movement. Check for:
* Debris: Dirt, leaves, or other debris can jam the tracks. Clean them thoroughly.
* Frozen Window: In cold climates, ice can freeze the window in place. Try warming the area with a hairdryer (carefully!).
* Bent or Damaged Window: The window itself might be bent or damaged, preventing smooth movement.
* Window Stuck in Frame: The window might be jammed against the frame. Carefully try to gently coax it free, but be cautious not to force it.
* Disconnected Window Components: A cable might have come disconnected from the regulator. This requires disassembly to inspect and reconnect.
* Faulty Motor (Despite the Sound): While you hear the motor running, it might not be generating enough power due to internal damage. This is less likely if you hear a consistent, strong motor sound.
Troubleshooting Steps:
1. Listen Carefully to the Motor: Is the motor making a strained or unusual sound? A grinding sound often indicates a problem with the regulator. A weak whirring could indicate a failing motor.
2. Inspect the Tracks and Rollers: Remove the interior door panel (consult your vehicle's repair manual for instructions; it's different for every car). Carefully inspect the regulator's tracks and rollers for any damage, debris, or binding.
3. Check for Obstructions: Look for anything that might be blocking the window's movement.
4. Manually Operate the Window (if possible): Some regulators allow manual operation as a last resort. Try to move the window up and down by hand (after removing the interior panel). This can help diagnose a binding issue or a broken cable.
5. Consult a Repair Manual: Your vehicle's repair manual will provide specific instructions for accessing and repairing your window regulator.
If you're not comfortable performing repairs yourself: Take your vehicle to a qualified mechanic or auto repair shop. Attempting repairs without the proper knowledge can cause further damage. A regulator replacement can be costly, so getting a professional opinion is often worthwhile.
