* Worn belt: The most common cause. Replace the belt.
* Failing tensioner: The hydraulic tensioner itself might be failing. It may leak fluid, be seized, or not be providing adequate tension. This usually requires replacing the tensioner.
* Pulley issues: A worn or seized pulley (alternator, power steering pump, A/C compressor, etc.) can cause increased belt wear and slipping, even with a correctly functioning tensioner. Inspect all pulleys for damage or roughness. Listen for unusual noises from each pulley when the engine is running.
* Belt misalignment: The belt might be misaligned, preventing proper engagement with the pulleys.
Instead of trying to "tighten" the tensioner (which you can't effectively do), focus on diagnosing the root cause of the problem:
1. Visually inspect the belt: Check for cracks, fraying, glazing, or other signs of wear. Replace if necessary.
2. Inspect the pulleys: Check each pulley for free rotation, unusual noise, or damage. Replace any that are worn or seized.
3. Check the tensioner itself: If the belt is visibly loose despite a new belt and good pulleys, the tensioner might be faulty and need replacement. Look for leaks or unusual movement.
To replace the tensioner (if necessary):
1. Consult a repair manual: A Haynes or Chilton manual specific to your 1997 Chevy Malibu 3.1L is essential. It will provide detailed instructions, diagrams, and torque specifications for your specific vehicle. Improperly reinstalling the tensioner could cause damage.
2. Loosen the tensioner bolt: This will allow the tensioner to release the belt's tension. You'll likely need a special socket or wrench for this.
3. Remove the old tensioner: Follow the instructions in your repair manual.
4. Install the new tensioner: Again, refer to your repair manual for the correct procedure and torque specifications.
Important Note: Working on your vehicle's engine can be dangerous. If you're not comfortable performing these repairs, take your car to a qualified mechanic. Incorrectly addressing belt tension can lead to serious engine damage.
