Humming sound

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aircargoo

aircargoo

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Hi all….2014 5.4 148000….96 degrees today…just drove around city/town…shut it off once. Ran over hour. Temp good…THEN…I HEAR A HUM SOUND …behind dash maybe under hood..should’ve pulled over. Anyway….goes away after like 5 minutes. Maybe coming from air filter…idk…sounded like a radio hum but wasn’t radio…behind cluster under hood maybe…..what do u think friends??
 
Yupster Dog

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I remember a thread on the forum about the driver side mirror trim whistling/humming in the wind.
 
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I know when the fan comes on in my 5.4 it's pretty noticeable. At low speed, high ambient, ac on the fan comes on frequently
 
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aircargoo

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Yes….i heard it again opened hood and FANS WERE LOUD…..never heard before like that. It was 95 1st day….second day was 100 but I heard it when I started truck…I opened hood quick…after 1 minute from opening hood I saw them shut down. I drove son to school back and ate idling at mcdees…drove again but didn’t come on loud again……maybe only 1 fan comes on when 2nd one goes on it’s louder….when I opened hood on driveway b4 leaving, both were going….i never heard loud like that….seems like it was spinning faster louder and both on….
 
whtbronco

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If you select Max A/C, select the highest fan speed and recirculate the fans should go to full speed. As I understand it all vehicles with e-fans do this. Certainly all of mine with e-fans do. That might give you a means of controlling the fans and determining if it's the cause of the humming.
 
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