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so yesterday I was reading and the vacuum booster controls the 4x4 and the ac and I was working with the switch controls for the transfer case and it engages just fine....my question is, is there a chance that it's just a vacuum leak or what could be my problem here? the ac is STILL only coming out of the defrost vents. does someone have a vacuum line diagram for a 2000 f350 so I can get my ac working before I leave to Florida in a few days?
 

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Mine did the same thing, and still does sometimes when I put it into 4X4 eventhough I replaced the hubs with warn manual hubs. Mine is fine and goes back to normal when I take it out of 4X4. Either way, Just chase the lines up from the wheels.
 
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