Hello everyone,

New to this site, and was hoping that some one would know what this unit is called, and or the part number for it. It's my understanding that it controls the auto locking hubs, and the heating/ac ducts via vacuum control. I have a 06 King Ranch 6.0L Diesel. 4x4, F350.

 

It's called a PVH Valve or Pulse Vacuum Hublock Valve. They're about $ 30.00 for a Dorman and around $60.00 for a Motorcraft one. I went cheep and bought the Dorman one and it's working fine. Here's a link to an eBay auction.

Fits Ford 99 10 4WD Differential Switch Dorman 600 402 | eBay

Here's a genuine Ford one on eBay: Ford part# 7c3z-9h465-a

Ford 1999 2010 Ford F 250 F 350 Vacuum Control Solenoid 4x4 Front Hubs | eBay

Before you purchase a PVH valve make sure you CAREFULLY inspect ALL of your vacuum hoses to & from the valve & to the hubs. Especially the rubber ones that run to the hubs. On my V10 I found a section of the poly tubing had melted where it ran down the frame next to the exhaust manifold. I replaced that section with some stainless 1/4" tubing I got from work and bent it to fit with a tubing bender. It will NEVER melt again. I also replaced the rubber hoses with 1/4" drip irrigation tubing - it's UV resistant - I did leave the short rubber hoses from the knuckle to the hub because the poly tubing would kink when turning the wheel lock to lock,

 

Awesome! Thank you for the help. I spent an hour trying to find that thing on line with no luck, but did find this site! I will take your advise, and go over the lines as you described.

 

I have a 2001 F250SD CC V10 doing same thing. Replaced lines from knuckle to hubs. They were super brittle. It got better for a while. AC blows out defrost most of the time. When stopped I can switch to 4H and AC will start blowing out dash vents. Switch out of 4H and accelerate goes back to vents.

 

Block off the lines to the PVH solenoid and see if the AC controls behave themselves. If so, the solenoid is leaking.

 

Try this post first (mine, #11).

 

Blowing out the defrost ports means you have a vacuum leak.

 

Here is what I did to mine when I had this problem.