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Old 11-21-2011, 02:00 PM
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What is this and why is it making this sound? Video inside



So this is with the key on and the truck off. It will make this sound with the motor on to and it wont stop. I dont know if it should be doing this or not. Does anyone know what this thing is and why it is doing this?

Also i went to ford and asked them if one of there techs could take a quick look and tell me what they think and i was told come back tomorrow. Really it would of taken 5 mins of there time. This is why i hate dealing with for and this is why i go to my personel tech.
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Old 11-21-2011, 03:21 PM
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Do you have automatic 4x4 with the turn knob near the radio to go from 2 wheel drive to 4 wheel drive? That's the little vacuum module that engages the hubs to lock/unlock. Sounds like she's taking a dump.
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Old 11-21-2011, 03:51 PM
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so if i disconnect it for now it wont hurt it right? I know i wont have fourwheel drive but i wont need it for a few days im guessing.
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Old 11-21-2011, 04:10 PM
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If its vacuum controlled, when you disconnect it you'll have a vacuum leak, so if that's the route you go make sure you cap that line off.
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Old 11-21-2011, 04:13 PM
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Yes, just disconnect the electrical plug and leave the vac lines connected. That will take care of it for now and you won't have any vac leaks
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Old 11-22-2011, 06:41 AM
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Well I unplugged it and I can still get the truck in fourwheel drive. Any otherr thoughts? By the way it still drives fine unplugged.
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Old 11-22-2011, 06:50 AM
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That is a vacuum PUMP! If its constantly running then you have a vacuum leak. If you unplug it then you will only have defrost, since the mode doors are actuated by vacuum. Do you have ESOF 4x4? If so thats probably where your leak is. Your 4x4 will work without it if you manually engage the hubs (if you have auto hubs.)


It dosen't sound bad to me. The one an my 7.3 (and every other one I've heard) sounds the same way.
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Old 11-22-2011, 08:27 AM
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Well looks like I will be trying to find a vacume leak. Thus should be fun
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