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Replacing the serpentine belt on your Avalanche is similar to any GM truck these days.

Look for the grey idler pulley, hook in a 5/8 socket on a 1/2 drive breaker bar and pull. Make sure you have a good connection.

The whole process takes about 5 minutes, you should have a diagram on your fan shroud to show how the belt gets routed if you forget.

Chevy parts www.gmpartsclub.com You can find the serpentine belt here for all chevy trucks.
 

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Two belts in the Avalanche

Most Avalanches have A/C anymore, the AC is driven off a 2nd belt for any Avalanches (2002-2005 at least). It's behind the big serpentine and has it's own idler adjuster.
 
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