Defrost comes on when 4x4 switched. - Ford Powerstroke Diesel Forum
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Old 09-18-2012, 05:58 PM
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Defrost comes on when 4x4 switched.

Ok, so just regreased auto hub w/ new oil and I'm still having the same problem. Whenever i switch to 4x4 with the switch, my a/c blows thru the defrost. When i check the vacuum after the solenoid there is low vacuum going to the hubs and the red line has more vacuum. Anyone know what's going on?
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Old 09-18-2012, 06:09 PM
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TONS of threads on this.
It's vacuum controlled obviously, the front hubs. You have a vacuum leak. Defrost means there is no vacuum on the blend door actuator and it is reverting to default.
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Old 09-19-2012, 12:26 AM
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Go to the vacuum pump and trace all the lines. Some go inside the cab, some go to the wheels.
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Old 09-21-2012, 08:00 AM
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from the pump there is only a red line, it's tee into the 4x4 solenoid and somewhere into the dash. My vent works fine when I'm not using 4x4. Also is it normal for the vent to blow thru the defrost when i first start up my engine. It only blow threw the defrost for a second or 2 during when i first start up.
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Old 09-21-2012, 10:50 AM
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Quote:
Originally Posted by Jerry@tx View Post
from the pump there is only a red line, it's tee into the 4x4 solenoid and somewhere into the dash. My vent works fine when I'm not using 4x4. Also is it normal for the vent to blow thru the defrost when i first start up my engine. It only blow threw the defrost for a second or 2 during when i first start up.
Since your vent setting works fine in 2wd then your vacuum leak is somewhere after the 4x4 solenoid.
It could be one of the hoses going down to the front hubs, or it could be a bad hub seal. Either one of these will cause the issues that you are having.

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Old 09-21-2012, 02:29 PM
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how would i know if the hub is leaking, i can disconnect from the hub and blow after the solenoid. But when it's connected i cant seem to blow thru it.
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Old 09-21-2012, 02:43 PM
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Quote:
Originally Posted by Jerry@tx View Post
from the pump there is only a red line, it's tee into the 4x4 solenoid and somewhere into the dash. My vent works fine when I'm not using 4x4. Also is it normal for the vent to blow thru the defrost when i first start up my engine. It only blow threw the defrost for a second or 2 during when i first start up.
Did it leak before you pulled the hub?
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Old 09-21-2012, 05:46 PM
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yes, air was blowing from the defrost before i did anything to the lines or hub.
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Old 09-23-2012, 12:54 PM
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I am also having this issue. Any idea what size vacuum hose goes to the hubs? I am getting ready to do front ball joints so mine as well tackle this issue to. I am also looking for a vacuum hose diagram if there is such an animal.

Sent from my DROID RAZR using AutoGuide.Com Free App
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Old 09-23-2012, 01:03 PM
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they are such a simple system you wont really need a diagram
you can follow the lines from the hubs up and from the ESOF valve on the pass fender down
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