4X4/Defrost - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 08-08-2007, 03:12 AM Thread Starter
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4X4/Defrost

My brother has a 02 7.3 and when puts it in 4x4 the air conditioning stops blowing through the dash vents and starts blowing through his defrost. What in the world could be causing this? I have no clue. Has anyone else seen or even heared of this?

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post #2 of 11 (permalink) Old 08-08-2007, 03:20 AM
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Actually my truck was doing the same thing only all the time. different prob, but mine was fixed when I put new vaccum pump on. Sorry no help

97 F-250 7.3 psd 4x4: homemade Intake, fpr mod, IDM mod, 18k mod, HX mod, a pillar w/ 3 autometer gauges, 3" downpipe, minus muffler and cat.
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post #3 of 11 (permalink) Old 08-08-2007, 03:32 AM
 
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I have the same problem, I just haven't fixed it yet. I saw on another thread that it is a vacuum issue. Have him check the vacuum lines for the autolock hubs. If they are leaking, the a/c will do that. It might be somewhere else in the 4X system but that is the main source that I have heard of.
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post #4 of 11 (permalink) Old 08-08-2007, 03:36 AM
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Mine does the same thing I changed my hubs over with winch hubs so I wonder if I just disconnet the vacuum lines all together for 4 wheeldrive if that will fix it.

anybody know how to d that?

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Originally Posted by sledneck57
Your sweating like a queer holding a hot dog.lol.
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post #5 of 11 (permalink) Old 08-08-2007, 03:50 AM
 
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the vacume hose going down to the front axle might have come off the vacume module , check to see if it came off
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post #6 of 11 (permalink) Old 08-08-2007, 02:02 PM Thread Starter
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so it is going to be a vacuum leak all together. I guess I will start at the hubs and work up.

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post #7 of 11 (permalink) Old 08-08-2007, 02:22 PM
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Yep it is a vacuum leak. Most of the time it is the inner hub seal or diaphram that becomes worn and leaks. I had to do mine and know of many others that have had to replace theirs as well...

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post #8 of 11 (permalink) Old 08-08-2007, 02:54 PM
 
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yes. check ur vacuum line on the driver side axle. my buddies just did that the other day.
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post #9 of 11 (permalink) Old 08-08-2007, 09:38 PM
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Mine just started doing this also but mine is staying on the defrost all the time. Would mine be the vac lines or the vac pump as stated above? Guess I 'll have to do some investigating. Gene :mafia

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post #10 of 11 (permalink) Old 08-09-2007, 02:38 AM
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The HVAC system is designed to default to the defrost vents in the case of low or absent vacuum ...i think as a safety measure. The seals inside the vacuum actuated 4x4 hubs go bad, or you may have a torn/split/missing vacuum line all together.

Here's an article from 'that site' that details removal of the hub. This is replace the actual hub, but a seal replacement would involve the same.

http://superdutydiesel.com/wiki2/tik...p?articleId=35

I feel like i remember a much better article than that that I read one time, but I can't find it again.

Good luck,
paul

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