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2003 gmc envoy_slt
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Do you still have the original belt? If so it's probably due for a new one. There are two sizes. Your EXT needs the shorter one. Take the belt off, start the engine an see if the whine is still there. Try to do this when the engine is cool and don't let it run any longer than you have to. If the sound is gone, at least you have a starting point.:m2:
 
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