Ford Super Duty (1999-2016) :: HVAC Goes To Full Defrost And 4WD Does Not Engage
Sep 6, 2014
I have a 2005 F350 6.0 with 4 wheel drive.
Late last winter, the 4WD stopped working. I diagnosed it to be a vacuum problem. Like a moron, I purchased a vacuum pump and threw it in there, I just figured that it was bad. It turns out the new pump I bought was bad, but the old pump was fine... Go figure. At any rate, when I switch to 4WD, my HVAC goes to full defrost and the 4WD does not engage.
I think I've narrowed the problem down to the 4WD actuator, since if I hook the vacuum pump output directly to the hubs, the 4WD works fine. If I switch it into 4WD, I can hear the vacuum releasing in the actuator, but it doesn't seem like any vacuum actually gets routed to the hubs. It just opens to atmosphere.
I've noticed that after switching to 4WD, the actuator only "Releases" the vacuum for a few seconds, and then seems to close itself. Is this normal? If I cycle the 4WD selector from 2WD to 4WD repeatedly, it will continue to cycle.
1. Is there any way to service this valve, or should I replace it?
2. Is the valve acting normally?
3. Am I on track with this repair?
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When my hvac controls are turned to hot, I'm getting only luke warm air. When moved over to cold it feels like the a/c is on...granted it is 21 degrees here. What I've done so far:
1. Flushed the coolant system at the local COOP TBA
2. Flushed heater core-Both heater hoses are hot to the touch as well as the heater core itself. The hoses are within 10 degrees of each other tested by an infrared temp gauge.
3. Verified the blend door actuator is moving. I can see it spin while attached to the box as well as I pulled it out and plugged it in it will move from hot to cold.
4. Smacked the #$%! out of the blend door box.
The fan still functions as it should from low to high. The truck also gets up to operating temp as usual.
Is it possible the actuator is still faulty even though it moves and not going all the way to the heat side? I considered picking up a replacement but I hate to start throwing parts at it.
Did the blend door give up? The snow is here and I need the heat for those 4am waterfowl hunting trips.
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I made it home and started checking things out. Around the dash, airbag, glove box, on the window , headliner and carpeting, is covered in soot and smoke. the computer is now telling me that ALL the doors are ajar, power locks and key fob do not work, 3/4 of the window switches do not work and 1 window does not work now. I removed the glove box and the panel underneath it to look at the HVAC system.
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HVAC system and hose
HVAC system housing
Glove Box and Vent
Air bag and Vent
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