Rattling Noise From AC Belt Tensioner on GMC Sierra 1500

A rattling noise may develop from the AC belt tensioner. This can be caused by an internal fault with the AC compressor, AC performance may also be diminished when this occurs. Our technicians tell us that replacing the ac compressor will commonly correct this concern.


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Average mileage: 113,666 (61,000–190,000)
5 model years affected: 1999, 2000, 2001, 2002, more2007
8 people reported this problem
3 people shared problem details
ac compressor burnt up
Replaced AC belt tensioner. Bad bearing in the original.
engine running fine but now has started making rattling noise like something is loose. The noise is coming from the front of the engine where serpentine belt and fan is
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