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Q:

what will make the ac belt brake on 2001 BMW 330i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
replace a belt a month ago...it broke....new one started tiring up...
(1) Answer
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Sounds like you might have a damaged pulley or one of the bearings on the accessory pulleys might be worn out. Check for wobbling in the pulleys while the engine is running. Obviously, it could be other things but that is the first place to check/start.