On the Jeep Grand Cherokee, one v-ribbed serpentine belt, also called a fan belt, runs the alternator, power steering and air conditioner as applicable. Most V8 and later 6-cylinder models have an auto-adjusting belt tensioner system. The manufacturer recommends checking the serpentine belt every 7,500 miles or 6 months for potential replacement due to normal wear.
Find the belt tensioner pulley. The tensioner pulley is generally between the crankshaft and a component toward the top of the hood area.
Check the belt routing so you know how to replace the belt. You may be able to find a belt routing diagram on a decal on the fan shroud or in support documentation. Otherwise, make you own sketch for reference.
Rotate the belt tensioner pulley, using the wrench, to and relieve tension on the belt.
Slip off the old belt and slowly release the tensioner pulley.
Use your belt routing diagram to put the new belt onto all of the pulleys. Pay close attention to the water pump pulley, as incorrect routing can cause the water pump to run backwards and overheat.
Make sure the belt is correctly routed and seated on all pulleys. Rotate the tensioner again to allow for the belt to slip onto all pulleys and then release the tensioner again to regain correct tension on the belt.
