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Old 05-17-2015, 08:28 AM   #3
78F350
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Join Date: Jul 2014
Location: Oklahoma
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Garage
There are two fans in that area, the engine compartment blower and the secondary air injection blower. Both are fairly easy to access from the top with the engine cover removed.
Remove the engine cover and listen to be sure where the noise originates, and pull the offending fan. Maybe dirty, or maybe worn out.
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