2006 DTS, approaching 100,000 miles. I changed the water pump belt and tensioner. About to change the serpentine and idler pulley (preventive maintenance). Never even thought about the serpentine tensioner....is there any reason to change that as well? Pulley looks to be in good shape on the tensioner.
Thanks
Unless its making noise, there is no need. I too had replaced the water pump belt tensioner.
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