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The bolt is left handed thread so BE CAREFUL. Try to remove it the traditional way and you"ll snap the bolt. You set your socket wrench to "Tighten" and remove the bolt that way. Install is the reverse (set to loosen). Or if you're using a box wrench pull or push towards the front or the car. You can also change the whole assembly which isn't hard. Once again be careful with the 2 plastic coolant pipes on the assembly that goes into the engine block. Wiggle them out gently while pulling on them.

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Q: How do you replace an idler pulley on a 1995 Buick Riviera?
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