A/C in 4X4 - Ford Powerstroke Diesel Forum
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Old 08-16-2011, 05:31 PM
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A/C in 4X4

Ok gang, I put my EXC in 4x4 the other day with the A/C on and it switched to defrost until I went back into 2wd. Tried looking it up online but didnt see anything. Any one else heard or have this? thanks
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Old 08-16-2011, 05:55 PM
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It is very common. Check the vacuum lines running to your front steering knuckles for the esof. Chances are one is disconnected, cracked, or leaking. If the lines are good, then you have a vacuum leak inside the hub which requires repair.
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Old 08-16-2011, 06:24 PM
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Could it be the vacuum pump too? Also if it is the hub how difficult is the rebuild? Thanks and I'll check it out in the A.M.
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Old 08-16-2011, 06:34 PM
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No-if the a/c switches vents and blows properly until you use the esof, the pump is fine, you just have a vacuum leak in the esof system. If the pump were bad the hvac would always blow through the defrost.
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Old 08-16-2011, 06:42 PM
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I really appreciate your help. Thanks again!
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