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.
Average mileage: 142,333 (122,000–155,000)
6 people reported this problem
It sounds like the serpentine belt is hitting resistance for a few seconds at startup, then quits. When the a\c kicks on, it makes a fluttering (almost humming) noise.
Squalling while engine is running. Sometimes quieter when engine has been running long periods of time. Replaced both tensioners, no joy. Narrowed down to AC Compressor pulley as increased tension makes squall very quiet, reduced tension makes lots of noise. No pulley/clutch assemblies sold independent of entire AC Compressor. AWESOME!