Symptoms
- Window moves noticeably slower than other windows
- Window jerks, stutters, or pauses partway up or down
- Possible grinding or straining sound
- May get worse in cold weather
Likely causes
- CommonWorn window regulator mechanismCables can fray or the scissor mechanism can bind as it wears, causing uneven movement.
- CommonDry or dirty window channel/trackLack of lubrication increases friction on the glass as it travels up and down.
- PossibleWeakening window motorA motor nearing failure often shows slower, weaker movement before stopping completely.
- PossibleDebris in the window trackDirt or small objects can catch in the track and cause jerky movement.
What to do
- Clean the window track and rubber channel with a soft brush or cloth to remove dirt and debris.
- Apply a silicone-based lubricant to the window channel and let the window cycle up and down a few times.
- Note whether the problem is worse in cold weather, which can point to old, stiff grease on the regulator.
- Listen for grinding or straining sounds, which suggest the regulator mechanism itself, not just the track.
- Have the window regulator inspected and replaced if lubrication doesn't improve it, since a failing one usually gets fully stuck eventually.
- Address this before it fails completely, since a full failure often happens at an inconvenient time.
Tools and parts
- Silicone lubricant
- Soft brush or cloth
Silicone window channel lubricantSearch: “silicone lubricant for window channel”
Window regulatorSearch: “window regulator for [year make model]”
When to call a pro
If cleaning and lubricating the track doesn't help, a shop can assess whether the regulator or motor needs replacing before it fails completely.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.