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there's a spring loaded tension-er on the right side of the engine.. look at your belt diagram on your engine and you'll see the belt tension-er looking like it's pointing to the northeast of the little diagram.. the easiest way to relieve the pressure is get a crowbar, pull up on the tension-er until it relieves the pressure. I'm actually putting a new belt on my 91' 3.1 Corsica

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Q: How do you relieve the tension on serpentine belt in a 1990 Corsica 3.1 Lt?
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