Location and identity of 4x4/HVAC vacuum swithches - Ford Powerstroke Diesel Forum
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Old 03-18-2014, 07:06 AM
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Location and identity of 4x4/HVAC vacuum swithches

Hello All:

I am a newbie to the world of diesel, and this forum. Please be gentle with me. I have an 03 EX Limited and have had HVAC only through defrost and no ESOF 4WD drive for some time. Have done research and am well aware that the problem is likely vacuum related. I had a dead Vacuum pump. replaced that it now works. Runs constantly, indicates a leak. Recently I found what is likely another big piece of the puzzle. there is a thin (2mm id +/-) grey fairly stiff plastic vacuum line that comes through the firewall high on the passenger side bundled with a larger (4mm id +/-) black rubber vacuum line. The grey line had apparently fallen of its nipple and melted on the engine block. I have a friend with a 6.0 and he took the attached picture of the unit the grey line attaches to. It is what looks like a vacuum solenoid mounted on the coolant line running to the heater core (picture attached), located on the driver's side and slightly to the rear of the oil fill pipe. The nipple on the front of the switch/solenoid is too small for hose to go on directly. 2 questions; (1) what is this switch/solenoid called; (2) how does the grey plastic hose attach to it (i.e. via a coupler, or did I lose another critical part/end when the grey hose melted and the end disappeared? Your insights and pictures of parts/assembly will be greatly appreciated. Thank you.
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Location and identity of 4x4/HVAC vacuum swithches-pic-switch-solenoid.jpg  

Last edited by Rugger9de; 03-18-2014 at 07:08 AM. Reason: Forgot a detail
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Old 03-18-2014, 07:25 AM
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the piece is the heater control valve and the grey line hooks right to the nipple on front of it with a rubber vacuum end , I have seen some aftermarket heater control valves be a smaller nipple , may have to fabricate you a piece of line to make it fit

the heater control valve only operates when a/c is on, you can just block off the grey line to make sure that fixes youre issue , and its not that big a deal that its not attached to the heater control valve , you really wont notice the difference
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Old 03-18-2014, 07:29 AM
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Thanks Scuffy. I'll give it a try and we'll see what happens.
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