* Broken or disconnected window regulator: This is the most common cause. The regulator is the system of cables and tracks that actually moves the window. A broken cable, a slipped track, or a disconnected component will prevent window movement even if the motor is working. You'll likely need to replace the entire regulator assembly.
* Binding in the window mechanism: Something might be obstructing the window's movement. Check for debris, damage to the window itself (cracked or warped), or something interfering with the tracks. Try gently pushing and pulling the window to see if there's resistance.
* Faulty window switch: While less likely if the motor runs (meaning power is getting to the system), a faulty switch could be sending intermittent or incorrect signals. Try testing the switch with a multimeter or by swapping it with another window switch (if the other switches work correctly).
* Wiring issues: While less probable given the motor runs, a broken or frayed wire in the harness leading to the regulator could be causing a problem. Inspect the wiring for any damage.
Troubleshooting Steps:
1. Inspect the window visually: Carefully examine the window and regulator mechanism from inside and outside the door. Look for broken cables, bent tracks, or any obstructions. You might need to remove the door panel (there are many online guides specific to the 2001 PT Cruiser) to gain access for a proper inspection.
2. Listen carefully: When you operate the switch, listen closely to the window regulator mechanism. You might hear unusual sounds like grinding, clicking, or snapping, which would indicate a problem with the regulator.
3. Check for power at the motor: If you're comfortable with basic electrical work, use a multimeter to check if power is consistently reaching the window motor when the switch is activated. This will help eliminate the switch and wiring as possible causes.
4. Test the switch (if possible): If you can safely access the switch wiring, see if you can bypass the switch and directly power the motor (only do this if you are comfortable working with car electricity and understand safety precautions. Incorrectly wiring could damage your car's electrical system).
Likely Solution: The most probable solution is a faulty window regulator. Replacing this part often involves removing the door panel, detaching the old regulator, and installing the new one. Many online tutorials and repair videos are available for this specific repair on a 2001 PT Cruiser. If you're not comfortable with car repairs, taking it to a mechanic is recommended.
