I can not find a way to release tention on belt there is no tension release which I can use a 3/8 drive on it is a 8.1 litre no tension release just pully below alternator. Ok found the tension release it had no rachet hole you have to use a 5/16 sock on top of tension pully to release tension thanks folks..
Remove Serphatine Belt on 2001 Chevrolet Silverado 3500
by Mrcrowley1967 in Manchester, NH on June 26, 2010
ANSWER by Visitor , January 28, 2011
There is a 3/8 square hole on the Idler pulley to use to loosen the pulley to remove the belt.The pulley is spring loaded.Put a 3/8 drive 4" extension on a 3/8 drive socket wrench & insert it in the 3/8 hole.Just pull & the pulley will move to pull the belt off.You'll have to hold the pulley with the wrench untill you remove the belt.