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The fan runs a lot faster than is needed. One approach is to put another 12v fan in series with the first; both will run slow and without noise. Another option is to put a resistor in series with the existing fan to slow it down.
Do a search ... there are a couple of long threads on the fan noise problem.
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John W. Irwin
2005 Classic 28 "Sabre-Dog III"
2007 Silverado 2500HD Duramax/Allison LTZ
WBCCI Region 9 Webmaster, #9632
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