The serpentine belt on my Chevy Astro van keeps breaking. I have replaced it twice in two years and thirty thousand miles, isnt this too often?

Serpentine belts are normally good for 50,000 to 65,000 miles or five years and should not break during that period. Belt breakage is almost always a symptom of misalignment, a wrong belt or pulley or pulley damage. If any component has been replaced on the engine, such as an alternator, AC compressor or water pump start with that.

Parts not properly mounted to the engine, such as an AC compressor, can cause the belt to be misaligned. Sight down the belt and make sure everything is in a straight line. If not, you must determine the cause and correct it.

Serpentine belts have a specific number of groves which correspond to grooves in the pulley. For instance, if the belt has five grooves and a six groove pulley is installed, it will quickly destroy the belt. Improper alignment can also result from loose, wrong and worn parts.

A worn idler pulley and/or belt tensioner can cause wear and misalignment. An improper belt for the application is another source of problems. I have always had ... more.

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