Pry up on the tensioner and remove the belt. Then replace itusing the schematic on the fan shroud. If there isn't one, draw one before removing the belt.
You have to put the transmission and motor on blocks and remove the motor mount to get the belt off and then slide a new one on.
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Check www.autozone.com, they have a Repair Info section that covers Buick LeSabre with this info.
what actuator?
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replace tension put it on
Take it to a Buick Dealership