If it is a Ford, the a strong possible is a blown elastomer. Ford Elastomers seem to self-destruct after about 12 years or so. I've taken apart and bodged about 6 Ford power window motors in various cars. You can remove the elastomer from the equation by epoxying it or screwing it to the shaft depending on model. Or you can remove the wasted shreds of your elastomer (if you are like me) and just permanently affix actuator to shaft.
In the future, tell us what year, make, and model vehicle you have. Makes it easier to answer questions.
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