when 4x4 switch on defrosters come on - Ford Powerstroke Diesel Forum
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Old 08-11-2011, 09:46 AM
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when 4x4 switch on defrosters come on

When I put the truck in 4x4 after a few seconds it send all of my AC to the defrosters, and also does not engage into 4x4 or 4 low. Guessing it is a vacuum leak not sure though. The truck is electronic 4x4 not on the floor. Thanks
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Old 08-11-2011, 09:48 AM
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vacuum leak causes the hubs not to engage and it to blow out the defrosters. 4wd will still work if you manually lock the hubs.
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Old 08-11-2011, 09:51 AM
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alright thanks i did notice if I do lock the hubs in it will work. any easy way to track down the leak?
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Old 08-11-2011, 09:54 AM
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Someone else might have some tricks or spots to check. I've never had the problem so I wouldn't know. I'm sure someone else will chime in soon.
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Old 08-11-2011, 10:36 AM
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I had the same problem, my leak was right under the hood, on the passenger side.....i had a cut hose....not sure how it happened but thats were it was...
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Old 08-11-2011, 10:47 AM
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There's 3 rather common places I know of.

1. On the front axle itself where the line comes from the vaccuum pump to the axle for the front hubs (this will cause the most vaccuum to be lost).
2. On the passenger side fender well there is a vaccuum "box" mounted near the fan "box".
3. The valve on top of the passenger side valve cover that runs inline with the heater hose has a gray hose that always pops off (I hate that damn thing).

Another thing you can do is crawl under the front of your truck and have someone turn your ESOF switch to 4x4, hold it there for about 30 sec then switch it back to 4x2. You, laying under the front of the truck, should hear the vaccuum pump kick on, now go find your leak!
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Old 08-11-2011, 05:42 PM
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if you lay under the front of your truck look just above the axle, the vacuum lines go through a bracket and have a plastic connection there, that is a very common thing to break and that would cause a bad enough leak to give you these symptoms. also if you run the truck long enough with a vacuum leak you will likly suck a bunch of dirt and water into your vacuum solenoid and reck that too. it is the chaeper fix atleast compared to the vacuum pump, which at my local stealership was doulble the price of the solenoid.
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Old 08-11-2011, 05:52 PM
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Holy crap! I have this same problem too! I thought it was normal! Hahaha! Shows how much I actually use 4 wheel drive. Thanks guys!
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Old 08-21-2011, 03:03 PM
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Quote:
3. The valve on top of the passenger side valve cover that runs inline with the heater hose has a gray hose that always pops off (I hate that damn thing).
I hate that damn thing too!!!


The rubber connector fitting is loose where it connects to the little solenoid that controls the blend door. It seems like it must get too hot and expands either creating a loose connection or pops off completely.

I wish everything was electronic. If a diesel does not create vacuum like a gas engine does, why go through the trouble of adding a vacuum pump, solenoid and all those darn lines?
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