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Q:

how to adjust tension pully for serpentine belt on 2000 Chevrolet Tracker

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
serpentine belt broke
(1) Answer
if it's the 'accessory' drive belt, then you need to pull against the tensioner (spring) with an appropriate wrench. Be careful, it could snap back on you.
If it's the cooling fan belt, you need to use a wrench to loosen the fixing bolt holding the tensioner position. to loosen it