I had to change the altenator on my 2006 on the side of the road. Once I got the 1/2" drive johnson bar on the tensioner I took a ratchet strap and went across to the other side of the truck and took the tension off the belt and was able to change the altenator. this may work to change the belt as well.
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-jtrentvin332 I forgot to mention during our chat that to remove the serpentine belt, all you have to do is pull the tensioner back. The tensioner has a square hole in it. Use a 1/2" breaker bar and stick it into the hole and pull the tensioner back to release the tension while you slip the belt off of one of the pullies. You don't have to take the belt off of all of them...Just so you get it off of the power steering pump pully.
It should not require any adjustment. the right tension is provided by the idler pully. If you want to release the tension for serpentine removal or examination release the tension on the idler pulley in the rear of the motor, spin the nut in the center like you were tightening, and the pressure will be released from the serpentine belt. Reversely, the appropriate tension will be given using the same way when the strap is reinstalled.
Fig. Accessory serpentine belt routing-3.0L engine
Fig. Accessory serpentine belt routing-3.8L engine
Removal and Installation
Fig. Drive belt tensioner wear indicator marks
Fig. Place a wrench on the drive belt tensioner bolt and rotate the assembly clockwise to relieve belt tension
Using a 15mm wrench attached to the drive belt tensioner pulley, rotate
the tensioner clockwise to release the tension. Remove the drive belt
from the pulley. When installing the new drive belt, ensure that the
drive belt is routed correctly and note the position of the indicator
mark on the tensioner.
Hope heled with this; remember rated this help. Good luck.
There will be a tensionor pully, that is a pulley that is connected to an arm that is spring loaded in order to produce tension on your belt. By releasing tension on this pully, you can remove the belt. The pulley will have a way to do this using hand tools. Most have either a bolt head you can grip with a pry bar and the appropriate size socket, some have a square hole where the socket - drive pry bar will fit directly, but the age old plain pry bar can be used by itself to release the tension. This should be done with two people if possible, one to release the tension while the other removes the belt... Here is a link to the diagram of your serpentine belt layout... http://www.mvreader.com/multiview/dayco/zoom.php?zoom_item=C0002R&l=n&catalog=auto&category=2
There is a tensioner idler somewhere on the engine. Use a wrench and rotate the bolt in the center so that the pulley moves away from the belt, then use the other hand to slide the serpentine belt out from under the idler. Slowly release the tensioner.
You need to find the idler tension pully. This moves up and down with the aid of a large spring. Placing a large wrench on the nut in the middle of the tension pully, you will be able to move it up or down to release the belt and install it.