To stop a serpentine belt from squealing, check the belt for wear, and replace it if it is damaged. If the damage is minimal, spray the inside of the belt with belt dressing while the engine is running.
- Check the belt for wear
Inspect the appearance of the belt, and look for signs of severe tearing. Insert the narrow end of a belt wear tool between the grooves of the belt. Replace the belt if the tool is flush with or below the grooves.
- Obtain an assembly diagram for the serpentine belt
Locate the assembly diagram for the serpentine belt underneath the hood. If your vehicle does not have one, look for it in your repair manual or draw one by hand.
- Remove all necessary parts
Determine which parts need to be removed to gain access to the serpentine belt, and remove them.
- Remove part of the belt
Place the serpentine belt removal tool on the tensioner bolt. Rotate the bolt slightly, and remove the parts of the belt that rest on smooth pulleys.
- Remove the rest of the belt
Turn the bolt again, and remove the rest of the belt.
- Install the new belt
Use your diagram to install the new belt loosely, and turn the tensioner bolt simultaneously.
- Secure the new belt
Tighten the belt around the crankshaft pulley, followed by the grooved pulleys and ending with the smooth pulleys. Tighten the tensioner to the recommended spec.
- Put the engine back together
Return all removed parts.