Ford Super Duty (1999-2016) :: Vacuum Pump Doesn't Shut Off In 4x4?
Jun 1, 2016
So my auto locking hubs have not been working for a couple years and I have just been locking them manually as needed. But now I have a boat and I like putting the truck in 4x4 at the landings just for added safety. It's difficult to manually put the truck in and out of 4x4 for just a few minutes when I know I have auto hubs. Plus I recently got aftermarket rims and they cover the manual locks, which can be accessed with a screw driver, but again, tough.
So today I bought the vacuum solenoid valve, whatever its called, and installed it, and they work! But the vacuum pump will not shut off while the 4x4 is engaged. The auto hubs work, my a/c controls work, everything works fine, the only symptom is the pump not shutting off. My a/c stays right where I put it, it doesn't go into defrost or anything, not even for a second, like it used to when my solenoid first started failing. Is the pump running normal? Or is there a leak on the other side of that solenoid? Should I even worry about it if everything else is working?
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I have a 2004 F-350 diesel. My vent selector is always on defrost so I suspected a broken hose but traced all out and all seem to be fine. I disconnected the line coming from the pump to the tank and no vacuum. The pump doesn't seem to be running but it's hard to tell with the engine noise and vibration. What tells the pump to run and how can I bench check it?
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Its hot in St. Louis and my windshield sure is staying cold (ac blows from defrost vents only).
1999 Ford F350 7.3 diesel 4x4 (4x4 lever on the floor). About a month ago, the ac starts blowing out of the defrost vents only. I assumed it was a vacuum issue.
Lines looked good; very plyable still. Canister looked fine. The vacuum pump on the pass fender well smelled burnt, so I replaced it. Got the new pump in and it didn't work. Checked the fuse panel and found two blown fuses, replaced them and the pump worked.
Here's my issues: if AC max is used, the vacuum pump stops working and air blows through defrost only . If the dash switch is in the off position and then turned back on, air blows through defrost vents again and vacuum pump will not work.
Is there a solenoid or switch to this vacuum pump that I'm not seeing?
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Haven't been on here for a while. My f250 AC vacuum pump is out. This means the AC being reverted to blowing out the defrost. I have found the defrost/vent vacuum solenoid and zip-tied it open for a vents-only experience. I just realized, without the vacuum pump, there is really no way of determining if it is on recirculate or fresh air. I wish for the recirculate so I don't get someone else's or my own exhaust in the cab. Does the system stay on recirculate without vacuum power? if not what actuator must I zip-tie next?
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I have a 2008 F350 FX4 with the 6.4l diesel, a couple weeks ago I was reprogramming the ecm and noticed the vacuum pump was running and wouldn't stop, so after a bunch of reading and testing i changed the solenoid vacuum valve. I tested all the vacuum lines and found no leaks.
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I have a 2005 F250 , 4.2 tdi diesel. I just bought the truck recently and still getting to know it.
I noticed recently that when I turn on the key, the vacuum pump starts running and does not go off. It seems to run continuously and will only shut off if I block the white outlet pipe with my finger. Is this normal or is the pump stuffed.
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How to diagnose a vacuum leak without a vacuum leak diagnostic tool.
My ESOF won't engage, AC/heat blowers default to defrost - classic symptoms. And while we can leave without AC/heat, we really need the ability to engage 4x4 low, especially as we get higher into the Andes and the roads unsmooth.
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How and where to check? This probably has been covered a million times.
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I have manual hubs on my truck. Can I pull those vacuum lines and plug the holes?
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I have a V-10 in my Y2K F-250. Under the throttle body there is an elbow on a vacuum line that is badly cracked. I went to parts store and bought a heater line that fit both ends (different sizes) but isnt the exact angle of the original. It fixed the hissing vacuum leak but now it is running pretty rough. Doesnt seem to be pinched but it's definitely different. The poor performance during acceleration wasnt a problem before but is very noticeable now. Could the line being different effect the performance?
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2002 F-250 SD XLT V10
While rummaging in my garage a couple of days ago I stumbled upon a vintage Stewart Warner mechanical vacuum gauge. I would like to install it on my truck.
My question is: Where is a a good connection point for the vacuum line? Detailed direction/photo preferred as I am both Ford and V10 engine challenged.
Same question with respect to following gauges:
Volt
Oil Press
Water Temp....
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I have recently developed a vacuum leak on my 2002 F-350 V-10 under the passenger side of the dash. It is only audible when I am accelerating moderately to heavily or when the truck downshifts going up a hill. None of the vehicles HVAC or ESOF functions seem to be affected by this leak from what I can tell, but it's rather annoying to listen to this loud sucking noise every time I hit the gas moderately hard such as climbing a hill or merging onto the freeway. I don't know how I could search for this leak since it only happens when I'm driving and accelerating and not at a stop. What might be going on or where I should begin my search?
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Truck has been neglected for a while so this upgrade/repair I installed Powerstop brake rotor, caliper, bracket and pads. New Timkin wheel bearing, Moog U-Joints, and new inner/outer axle seals. Also replaced all the brake hoses and the remaining original rusty brake lines. About a month before I replaced the failed Auto/Manual vacuum operated locking hubs with Mile Marker units, which do not need the vacuum line, the drivers side was missing. and was letting water into the wheel bearing. So I decided to plug them and remove the vacuum lines from under the hood as well.
If there is interest I can get pictures of the vacuum lines, and what I changed under the hood. That was pretty self explanatory.
Could not find a google search for the thread size of the vacuum nipple in the knuckle. It is a 3/8"-24 fine thread.
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I don't have any leaks at the moment, but after inspecting my vacuum lines they're starting to look brittle and I want to replace them proactively. Is there a kit to do this or should I just cut a section off and take it in to an auto parts store to match the size, and buy it by the foot?
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When I put my 06 f350 in 4x4 my ac defaults to defrost. I assume this means a vacuum leak. My question is, is the white tube supposed to be open for air intake or plugged off with something?
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Having trouble with vacuum on my '06 CCLB V10. I only lose vacuum while towing, not sure why. Lines all seem like they're fine. I have no issues while unloaded. What could be causing this?
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I have a 2005 f350 with the power stroke I went through the hole vacuum system all new hubs, seals, vacuum actuator and fixed it all now I'm having the reverse problems everyone has my hubs are locked all the time as soon as I plug in the vacuum actuator the transfer case is still in 2wd and will switch 4x4 and work and disengage but the hubs are always in unless I unplug the actuator ...
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I have a 2010 f 250 super-duty and i cannot get vacuum past the solenoid mounted on top of the radiator. Ford has given me nothing but bad advice. I know i have a vacuum leak after the solenoid and need to replace the lines going to the two hubs but when i switch on the 4wd and hook up a vacuum gauge the vacuum is good up to the solenoid about 12 inches. i constantly have 12 volts going to the center lead but nothing else in the other two leads either in 4 high, 4 low, or 2wd. Am I missing something here? shouldn't there be a voltage change when i turn the switch to 4wd to actuate the vacuum solenoid to let the vacuum pass thru the solenoid? I have tried replacing the solenoid but that did not work. Also use rubber vacuum line and make at down to the hubs?
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So I have an 05 f350 5.4 with the shift on the fly and the auto/manual locking hubs.. I already know I have a leak with the vacuum and I just use the hubs manually, then shift on the fly to activate the transfer case.
I went to use the 4wd the other night in a snow storm and I have no 4wd, light on the dash comes on and i can hear the transfer case clicking in when i hit the switch between 2wd and 4wd.
So I got under the truck while it was on the ground and manually locked the passenger side, Then tried spinning the axle and it wont spin freely, so obviously its locked.
Tried the same thing on the driver side and the axle spins freely while the hub is locked, So obviously the locking part of the hub is no good... So i guess my question is, even with just 1 wheel locking in the front, shouldn't I pretty much get 3wd? or am i missing something...will it not engage at all because both sides arent locked?
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So this morning I started my truck to move it out of the driveway and it sounded funny almost like I was running a ship vac under the hood. I moved it and shut it off and when I shut the truck off it sounded like screeching tires. I thought it was weird but chalked it up to it being cold. When I came home I started the truck again and I got the same vacuum noise. I figured I would let it run some since it was pretty cold out. All of a sudden I heard the noise stop so I went out and all I smelled was a burning smell but the truck was idling fine and running nice and quiet like it usually does. So I shut the truck off and then it wouldn't start again. So I tried to jump it still wouldn't start would barely try to crank. I crawled under smacked the starter a few times jumped it again and it started. I left it running for 20 mins after that no noise sounded fine. Any thoughts on what this could be?
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I have a 2001 F-250 7.3 diesel with an automatic trans. Over the last couple of months it has stalled 3-4 times while driving, always when slowing down but even at speeds of 15 mph or so. I did find a burnt vacuum line the other day. It comes out of some type of relay box located behind the battery and in front of the starter solenoid relay and is mounted on the fender. It has an electrical plug in the top and two vacuum lines at the bottom. I am hoping this is the cause of the truck dropping off of the idle circuit? But I don't know what the unit is so I cannot order the correct replacement lines.
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