4wd wont engage
Thread Starter
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New User
Joined: Aug 2006
Posts: 23
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4wd wont engage
Hey there everyone, I have a 2000 F350 CC and the 4wd is not engaging.I turn the switch in cab and the 4wd light comes on and I hear the servo motor switch. Nothing. I can engage them manually and they work great. Also I tried the vacuum leak test. I put the heater on front vent, switched ESOF, and waited to see if the heater defaulted to defrost. Nothing. Also tried to "learn" ESOF to work as posted an earlier post. Nothing.
Should I vacuum test both front hubs with a vaccum gauge or is the default defrost a reliable test. Any other options.
Thanks,
Ken
Should I vacuum test both front hubs with a vaccum gauge or is the default defrost a reliable test. Any other options.
Thanks,
Ken
Senior User
Joined: Sep 2007
Posts: 193
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From: Rexburg ID
the hubs still may not be getting vacuum if the defrost & inside heater controls work. At least you know your vacuum pump is working. You'll have to trace the vacuum tubing from the tank to the hubs first, then it is possible if you don't have a leak there to go to the hubs themselves which could be leaking.
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New User
Joined: Aug 2006
Posts: 23
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Did a vacuum test on both hubs, they didn't hold vacuum. Then I took some compressed air and blew some into the hub and could feel and hear the air escaping. I did not use very much pressure and the drivers side was worse than the passenger side.I have seen the posts on replacing the inner hub seals, and it looks like a big job.
