4 wheel drive not working - Ford Powerstroke Diesel Forum
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Old 09-11-2013, 02:34 PM
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4 wheel drive not working

Just got my 2002 F-350 back from getting the trans rebuilt and my 4x4 doesn't work, may or may not be related. turn the switch on dash no light. checked a bunch of things hubs and connectors on transfer case everything seems ok. Any ideas?
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Old 09-11-2013, 02:56 PM
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What're your vents doing? Do they blow normally or are they on defrost in every setting? You might need this: http://www.dieselsite.com/1999-2004f...ofhosekit.aspx

If so, its a common dry rot issue. If your lines look fine, trace them to the pump and troubleshoot there.
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Old 09-16-2013, 03:05 PM
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Read that or a similar post. Don't think it's a vacuum problem. Light on dash not coming on when turned to 4 high or 4 low. Could the trans shop have screwed something up in trasfer case when removing or reinstalling trans?
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Old 09-16-2013, 03:21 PM
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I don't know the differences in 02-03 7.3-6.0, so none of this may be relevant. But I just had the same issue in my 03 6.0...

When you initially crank the truck to start it, do the 4x4 and 4lo lights come on momentarily then turn back off? I just ran into the problem. Turned out to be my GEM (or 4wd module). Mine is located behind the glove box. The windshield was leaking and leaked right onto the module and killed it. If you are bored, here is my thread all about it and things I tested. But like I say, it came down to by a new module. $187 later.


4wd just seems dead, not working. Searched with no luck!
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Old 09-18-2013, 10:02 AM
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They probably didn't plug something in, this isn't a boost issue, it is electrical, take it back to the shop. Tell them it worked fine when you brought it in there.
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Old 09-24-2013, 06:40 PM
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Yes the light turns on when started then goes off. No the vents do not change to defrost when 4x4 turned on. All wires seem to be plugged in and not damaged. Can't find any vacuum leaks.
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Old 09-25-2013, 06:31 AM
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turn it to 4x4, then tap on the motor on top of transfer case. it could be stuck.
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