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Examine idler rollers for wear patterns.
If you see wear, they're not
You bring your car in for a new alternator and the mechanic wants to change out the serpentine belt, the tensioner and the idle roller too. Is it worth it?
Yes. Your mechanic is
actually looking after your
best interests. Belts, tensioners
and idler rollers rarely last the
life of the vehicle.
The additional labor for the
idler roller is minimal (about
$10), and the labor for the tensioner
usually runs about $50. If
you plan to keep the vehicle,
you'll save money in the long
run by replacing these parts now.