2007 Jeep JK 3.8L, Sound of a Bad Tensioner Pulley. I changed my water pump and then the Jeep started making this god awful noise. I thought the water pump was bad so I replaced the new one with the old one. It wasn't the Water Pump but the tensioner pulley.
Tags: 2007 Jeep JK 3.8L, Sound of a Bad Tensioner Pulley, Jeep JK Tensioner Pulley squeeling grinding noise