'05 F250 4x4 ESOF won't work - Page 2 - Diesel Forum

mont91 · 10-22-2009, 10:31 AM

Regarding the defrost. It runs on the same vacuum supply as the hubs in the earlier models and when it looses vacuum it defaults to defrost as a safety issue. Plug the vacuum supply to the hubs to prevent loss of vacuum while in 4 wheel drive. If you repair the vacuum hubs the defrost will work right. Make sure you are getting vacuum all the way into the hub I have seen several times the line or lines are damaged and the hubs were blamed. The '06 and up use a cartridge style hub from ford only. just bought one. Much better design than the old one. Different wheel bearing to, just replaced one. Apparently the '08 up use the vacuum pump for ESOF only as the manual shift does not have one.

gcoutlaw · 10-23-2009, 05:47 PM

Well, now that I have gon to Warn manual hubs anway, should I just then unplug the tube that is in the holder over the wheel in that small metal bracket and cap that off and see? Only an issue now when in 4wd (which is rarely) but would be comforting to have the problem resolved.

Tungsten · 11-15-2009, 02:36 PM

Durantdiesel... did the transfer case motor fix the problem for you? My 2004 is doing the exact same thing but a tech that I took it to said that he believed the transfer case motor on mine was fine.

No 4WD related lights work on the dash at all. There is no power on either side of the 4WD related fuse in the fuse panel either.

rcgreg · 11-10-2010, 04:43 PM

Quote:

Originally Posted by Tungsten

Durantdiesel... did the transfer case motor fix the problem for you? My 2004 is doing the exact same thing but a tech that I took it to said that he believed the transfer case motor on mine was fine.

No 4WD related lights work on the dash at all. There is no power on either side of the 4WD related fuse in the fuse panel either.

Which fuse # is that??

Tungsten · 11-11-2010, 07:56 AM

Quote:

Originally Posted by rcgreg

Which fuse # is that??

Man, that reply from me was last year... I'm surprised I was still subscribed to this thread.

I have no idea which fuse it was. Shortly after we got our ESOF system working again, the transmission started slipping real bad. This after we'd already sank $5K into it to have the turbo rebuilt, head studs, gaskets etc. and then another $2.5K into it because of injectors.

When the transmission started to go, we dumped that POS truck and never looked back. It'll be a pretty cold day in hell before I own another Navistar 6.0L Diesel anything.