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Old 01-06-2014   #1
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Exclamation 4x4 Problem 2004 F150 help

I have a 2004 F-150 5.4L (160,000 miles) with a problem with its 4 wheel drive. I recently replaced both bearings and actuators on the front end with OEM parts, but recently I have discovered that the vacuums that engage and disengage the 4 wheel drive will not turn off causing the truck to stay in 2 wheel - this has been a problem even before parts were replaced. When the tubes that are connected to the bearing/actuator are removed the 4x4 kicks on. Any information on this problem would be greatly appreciated.

Last edited by 2004 F150; 01-06-2014 at 06:27 PM.
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Old 01-06-2014   #2
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There are some vacuum valves that get wet and then need to be replaced. I believe they are on the firewall on the passenger side.
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Old 01-06-2014   #3
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Yes on the passenger side fire wall. Looks like this.

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Old 01-07-2014   #4
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Thanks everyone
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2004, 4 wheel drive, 4x4, bearing, f150


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