Question 4x4 not working 6.0

[gearbox]

hello new to the site. I really enjoy this site. I have a 2005 ford f250 four wheel drive. My 4 wheel drive just stopped working. I changed the vacum pump and even changed my dash board switch no luck. I checked all my fuses. I hope someone can give me some advice before I take it it. Thanks for your time! Hope to get answers.

 

[DaveBen]

I would bet big $$ that you have a vacuum leak in one of the front hubs! The ESOF hubs work on a vacuum signal that locks/unlocks them. Pull off the front wheels and look CAREFULLY at the vacuum hose and the connections. Look for a split line or a broken line near the couplings. Good luck, $%$#! ESOF.

Dave

 

[ckamp52]

X2 buddy

 

[gearbox]

thanks for the help, I will look into this.

 

[AK Rover]

Try manually locking the hubs and see if that changes anything. If so then I'll agree with the others that you have a vacuum leak at the hub.

 

[rustinh1]

That's what mine is. Vac leaks are a problem, especially after a few miles on the trucks. I think mine's in the hub seals now though....that one's going to hurt the pocketbook!

 

[95_stroker]

Make sure your transfer case motor is working.

 

[6.0PSD777]

T-Case Motor - My Uncle replaced his last year.

 

[tango555]

Which vacuum pump controls the 4WD? My vacuum pump that controls the AC vents went out, and now I noticed the 4WD not working. I'm assuming this is the pump that controls the 4WD? Located in the upper RH engine area...

 

[DaveBen]

There is only one vacuum pump, on the passenger's fender. It controls the Heat/AC and the ESOF.

Dave