Question about 2005 Ford F 350 Super Duty

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My 2003 F-350 diesel won't go into 4x using the dash switch. The airconditioning switches to the defrost vent when I try. Could there be a vacuum problem under the dash somewhere?

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Yes , Vacuum operates the A/C and Auto Hubs , Check the vacuum lines by the pump on the passenger side .

Posted on Oct 03, 2009

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