On vehicles with a single serpentine belt, tension is usually self-adjusted automatically via a spring loaded tensioner. No additional adjustment is necessary. If the belt is slipping or loose, then it needs replacing. Also check the tensioner bearings and replace the tensioner if necessary.
http://wiki.answers.com/Q/How_do_you_mount_a_serpentine_belt_on_a_chevy_lumina"
usually serpentine belts get their tension(tightness) from the belt tensioner
On my Chevy lumina it is located right by the gas take on the right side of the car.
Go to the parts store and ask for a new one.
The main pulley on which the serpentine belt goes on in a 1997 Chevy Lumina LTZ is the crankshaft pulley. The crankshaft pulley plays a role in the wheels turning and powering the alternator and power steering pump.
The Chevy lumina does not have an inertia switch.
The trunk release for a 1997 Chevy Lumina is located on the driver side floor. An emergency release is also located inside the trunk.
The alternator on a 95 Chevy Lumina 3.4l is replaced by disconnecting the wiring harness, loosening the retaining bolts, and removing the serpentine belt. The alternator can then be unbolted, removed, and a new alternator installed.
Chevy does not use inertia switches.
I have a 92 lumina 3.4 Mine was above the brake peddle
Inside the fuel tank.
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