Loud buzzing on acceleration and idle

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Crazylegs

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As the title said I have been hearing a loud buzzing noise coming from the front end of the truck. It seems as it is coming from the engine but almost as it is right under the dash. The noise sounds almost as if I have the wine of a super charger. The noise is constant from start up to acceleration. It doesn't matter if it is a cold or hot start. I am having a hard time diagnosing this, I have checked all the fluids. Somebody please help.
 

JUST4FUN

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When you rev up the motor does the noise go louder and faster? could be a fan clutch
 

steelnewfie

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I've heard of people getting a buzzing out of the fuse box/block on the first gens. It happened to me on a Mazda Tribute. I think if you search these and the F150 forums you can get the exact location and a number of descriptions of the problem. I believe a replacement of the unit is required.
 
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