replace tension put it on
If it is the same 3800 engine as the 1993 Lesabre--very simple. Alternator is right on top of the engine. Loosen the serpentine belt ( tensioner) - remove the mounting bolts that hold the alternator on the bracket- remove the wire connections.
Put the belt tensioner tool on the tensioner pulley, and push away from you. Then you can slide the belt off. You either need to cut it or unbolt the engine from its mount and slip it out.
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It can cost between $14 and $30 to replace a serpentine belt on a car. The price can raise to $40 or $60 if a person has it done at a car shop.
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To change the serpentine belt on a 1987 Buick LeSabre, first, ensure the engine is off and cool. Locate the belt tensioner and use a wrench to relieve tension on the belt, then remove the old belt from the pulleys. Route the new serpentine belt according to the belt routing diagram typically found under the hood. Finally, release the tensioner to secure the new belt in place, and double-check that it's properly aligned on all pulleys before starting the engine.
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If the tensioner isn't tight enough it's probably the spring. You can purchase a serpentine belt tensioner to replace the one that has become weak.
I had a 1995 buick lesabre and the A/C compressor went out in the winter time. I waited until spring to replace the compressor. In the mean time, I used a Dayco 72.10 inch belt and bypassed the A/C compressor and it runs fine.
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