I assume you mean the serpentine belt idler. I replaced one in the other Cadillac at 70,000+ miles. And this one I drive now has over 125,000 and I hear it squeaking and will probably replace it in the near future. Since they are sealed bearings and you are unable to lubricate them, The life depends on the driving conditions, such as dirt and grime. I suspect that dust storms in Texas causes problems with those bearings more so than someone in Michigan. The idea is they are designed for the average life of a vehicle, but what is average life? They do make replacements.
There is no way of telling how long an idler bearing will last.When it starts making noise you replace it.But there is no set interval that they have to be replaced.Hope this helps.Good luck.
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