I just finished replacing my actuator. My guide was still in place and the actuator worked fine, it just made a horrible noise. It all started after a bad storm and water got under the driver seat (clean your drains!!!) causing the car to go all Christine... the alarm was going off, the locks were constantly locking and unlocking, it was crazy. I think the actuator overheated or something. Anyway, the noise was in the actuator itself and happened after the mechanism completed the movement. It is as if, something was still spinning inside the actuator (after removing it, I could physically move the actuator and it would make the noise). The new one is smooth and quiet.
Did I mention you should check your drains? $1K lesson for me.
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