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Just a guess - many engines have a clutch operated cooling fan. If so, it wouldn't likely be engaged (in other words the fan would be free-wheeling) until the engine warms up. So maybe the fan is making the noise when the fan clutch is engaged? Perhaps the shroud is too close or loose and the spinning fan is slightly contacting it?
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Eric
North Carolina
2015 ACE 30.1, 2017 RAV4, 1999 F250, 1991 Honda ST1100, 1984 Alfa Romeo Spider, 1981 Alfa Romeo GTV6, 1961 MGA
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