air conditioner blowing thru defroster - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 03-04-2010, 07:09 AM Thread Starter
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air conditioner blowing thru defroster

My Max A/C is blowing through the vents and defroster. After a few searches, I tracked down a loose vacuum line under the hood. It's a gray line (easy to spot) that runs on the passenger side towards the block. The problem is, I couldn't figure out where it was supposed to attach???? Would anybody mind looking and letting me know??? When I plug it, the a/c seems to work right but I guess I have a hard time believing any fix can be that easy.


2006 F250 FX4 XLT Powerstroke


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post #2 of 6 Old 03-04-2010, 07:39 AM
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vacuum leak, how is your ESOF working?

Adam Brannan

First Coast Diesel Performance


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post #3 of 6 Old 03-04-2010, 08:18 AM Thread Starter
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May be a stupid question but what's an ESOF?

Just to clarify, the vent and non-recirculating a/c blow normal through the dash vents. It's just the max a/c that is causing problems. The vacuum hose I found was completely off and that's why I'm having trouble figuring out where is was supposed to attach. Any help is appreciated.


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post #4 of 6 Old 03-04-2010, 09:28 AM Thread Starter
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OK, found another guy with a Powerstroke that let me look under the hood. It hooks up to some thingy right above the oil filler cap. A/C is working.


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post #5 of 6 Old 03-04-2010, 10:00 AM
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ESOF -- Electronic Shift On the Fly, aka 4x4. Are you able to shift into 4wd and get power to the front wheels? I have a solenoid out and no 4x4 currently. My symptoms mirror yours only when I shift into 4x4.
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post #6 of 6 Old 03-04-2010, 11:07 AM Thread Starter
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I think what happened was they probably bumped it last time I got an oil change and I just never noticed because of the cool weather. I have used the 4wd since then (it snowed heavily last week), so I would say yes, mine was working properly.


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