Re: Cost to swap out tensioner pully
Depends on what engine and what year vehicle. However, from your description of the coolant hoses, I'll assume the old style with the 3.8L (L36/L67). Not sure if GM sells just the pulley, without the entire tensioner assembly.
Easy to diagnose with a long screwdriver to listen to the pulley while the engine runs.
On one of those engines mentioned above, the generator has to be removed.
As for one-hour time. I know of no dealers who charge anything less than one-hour to perform any job. In fact, a lot of aftermarket shops charge a minimum of one-hour to do any job (unless it is an advertised job like tire rotation, oil change, etc.)
Even furnace repair charge a minimum of one-hour.
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