The 1999 Jeep Cherokee employs an interesting idler pulley assembly. What you need to do is:
1. Remember the belt routing, it's not printed under the hood.
2. Loosen the 15mm hex nut on the idler pulley
3. There's a bracket that the idler pulley is connected to and a 15mm tensioning bolt to turn to release the tension off of the belt.
Jeep Cherokees seem to like Premium belts best.
The Jeep Grand Cherokee did not exist until 1993.
about every 60,000 miles. check it for cracks and stains. if its bad replace it.
Serpentine brote change
it is adjusted throught the power steering pump loosen the adjuster bolts remove belt and reverse
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