Ken,,you need to know that there is a serpentine belt on your highlanders engine.
Some people call the serpentine belt, the accessory belt.
This belt is used to operate the power steering pump, a/c compressor, water pump and alternator.
The serpentine belt should be inspected every 30,000 miles and replaced if there is damage to the belt.
Damage would consist of cracking,, splitting,,fraying,,glazing,,oil contamination.