Potential Problems & Adjustments:
* Window Regulator Issues: The most common cause of window problems is a faulty window regulator. This mechanism uses cables, rollers, and a motor to raise and lower the glass. Wear and tear, broken cables, or binding rollers can cause the window to bind, go off track, or not operate smoothly. This usually requires disassembly of the door panel to access and repair or replace the regulator. There's no simple adjustment; the entire regulator may need attention.
* Window Channel Lubrication: Dry or dirty window channels can cause binding. Apply a suitable lubricant (silicone-based is recommended) to the window channels to ease movement. Clean the channels thoroughly before applying lubricant.
* Window Glass: Check if the window glass itself is damaged or warped. A slight warp can prevent it from moving smoothly within the channels.
* Motor Issues: The power window motor could be failing or weak. This is less likely to cause a "tracking" problem, but a weak motor might struggle to raise the window completely. This also requires door panel disassembly to access the motor.
* Switch Problems: A faulty window switch could send erratic signals to the motor, but this wouldn't usually result in a specific tracking issue, more like intermittent or total failure to operate.
How to Investigate:
1. Inspect the window: Carefully examine the window's movement within the channels. Look for any binding, obvious obstructions, or signs of damage to the glass or channels.
2. Lubricate: Apply lubricant to the window channels and test the window operation.
3. Disassemble the door panel (with caution): This is generally required to access the regulator and motor. Consult a repair manual specific to your 1970 Corvette for detailed instructions on how to safely remove the door panel. There are many resources available online, including YouTube videos.
4. Examine the Regulator: Once the panel is removed, you can inspect the regulator's components for any damage or wear. Look closely at the cables, rollers, and the motor itself.
5. Repair or Replace: If you find damaged components, you'll likely need to repair or replace the entire window regulator assembly.
Important Note: Working on car door panels and mechanisms requires some mechanical aptitude and careful attention to detail. If you're uncomfortable disassembling the door panel or working on the window regulator, it's best to seek the help of a qualified mechanic. A repair manual specific to your 1970 Corvette is invaluable during this process.
