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Suggestion: check the belt tentioner pully, if that's o.k. then try the fan clutch.

i have a 2004 escape that did same thing it was due to having low Power Steering fluid

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Q: What is wrong with a 2003 Ford Explorer that has a hum sound when the engine is turned on and when you accelerate when no gas is applied the hum is a low sound then gets high when gas is applied?
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