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Look for the idler pully,it will be the one that runs against the back of your surpentine belt,It is spring loaded,it is smooth,use a breaker bar or 1/2 drive ratchet,there is a bolt head that sticks out of the front of the pulley find a socket that fits this bolt head it should be metric,make sure that you take note on how it is already installed so you can reinstall it the same way,using your tool put the correct socket on the bolt and pull in the direction that the pulley moves freely,then you can remove the old belt,there should be a schemetic on your radiator support that shows the routing of your belts.

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Q: Which pully do you loosen to change the belt on a 1993 GMC Sonoma?
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