Q: There is a lot of slack on my serpertine belt ?

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My serpertine belt has a lot of slack on it I'm wondering is cause my tensioner pulley?

My car has 160000 miles.
My car has an automatic transmission.

It sounds like you may have either a stretched serpentine belt or more likely a tensioner pulley that may need to be adjusted to reduce the excess slack in the belt. I would suggest having a professional from YourMechanic come to your location to inspect and adjust the belt.

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