* Broken Window Regulator Cable: This is the most common culprit. The cable that connects the motor to the window has frayed, snapped, or come off its pulleys. You'll need to replace the entire regulator assembly.
* Binding or Jammed Window Mechanism: Dirt, debris, or damage within the window track can prevent the window from moving smoothly, even if the motor is running. Check for obstructions in the tracks and clean them thoroughly. Inspect the window's felt seals as well; a severely damaged seal can restrict movement.
* Worn or Damaged Regulator Gears/Pulleys: Inside the regulator assembly are gears and pulleys that can wear out over time. If these are damaged, they won't effectively transfer the motor's power to the window. This usually requires replacing the entire regulator assembly.
* Faulty Motor (Less Likely): While you say the motor runs, it's possible the motor is weak or intermittently failing. This is less probable since you mention it runs, but it could be worth testing the motor's strength directly (if possible without disassembling) to rule it out completely. A weak motor might still make noise but lack the power to lift the window against resistance.
How to diagnose and fix:
1. Visual Inspection: Start by carefully inspecting the window track and mechanism. Look for any obvious signs of damage, debris, or broken parts. You might need to remove the door panel to get a good view. (There are many online tutorials showing how to remove the door panel for a 1992 Crown Victoria.)
2. Check for Obstructions: If you find debris, carefully remove it.
3. Test Window Movement: Try to manually move the window up and down. If it moves freely by hand but not with the motor, the problem lies within the regulator mechanism itself.
4. Replace the Regulator: If the cable is broken, the gears are stripped, or the pulleys are damaged, you will almost certainly need to replace the entire window regulator assembly. These are relatively inexpensive parts and can be found online or at auto parts stores. Replacing it requires patience and some mechanical aptitude, but again, there are many videos online guiding you through the process.
In short: The most likely solution is replacing the window regulator. Start with a thorough visual inspection, and if you're not comfortable working on car mechanics, take it to a professional. Don't force anything, as you risk causing further damage.
