Ford Super Duty (1999-2016) :: 2006 F350 - AC Switches To Defrost Then Takes 2 Min To Return To Vents When Shift Into 4X4
Feb 22, 2016
2006 f350 DRW King Ranch diesel with 94,000 miles on it. When I shift in to 4x4 the AC switches to defrost and then takes 2 min to return to the vents. I imagine this is a vacuum leak issue. Where to start hunting? I pulled the dash for another install and all lines were connected. I will say the vacuum pump stays on longer than normal when the ignition is first activated.
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It's a 2006 F250 Super Duty, 4WD AT, no auto hubs, 5.4L. All climate functions come out through the defrost vents. That mean when I'm using A/C it works, but comes out the defrost vents, or if it's a cold day and I want to use the heater it comes out the defrost vents. (So does defrost! LOL) Once or twice things went back to normal, but then, once when I had some cargo on the passenger's floor, I heard a hissing sound and it all went back to the defrost vents. Been there for a while now. Dealer wants to charge an arm and leg to look at it and then all arms and legs to fix it, and wouldn't you know it's not covered on my service plan!? Remember, these 4WD front hubs are not auto. I get the idea that to do anything under the dash means I have to disassemble the entire truck down to every last bolt.
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I would like to do the high idle mod with my 2006 F-350 using the upfitter switches. I've seen a couple of threads about this but they are not real clear to me and don't mention the 2006.
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2006 F250 with the dash controlled 4x4. I typically keep the front hubs locked on this truck. I have recently noticed that when shifting into 4x4 that the a/c or heat will switch from blowing out of the vents to blowing out of the defrosters. Any clues how to fix this?
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I have a 2006 F-250 Super Cab with climate control. The last three years when the temp exceeds about 85 degrees outside it acts up. It will switch from the AC vents to defrost and blow normal air through, not ac cold. Then it will switch back, when doing so I can hear the internal deflector shudder. It will do this every few minutes. It is extremely annoying. All other times of the year it works fine. My local dealer had the truck last year, but could not find anything wrong. I have used the search and also Googled and while I find similar problems nothing exactly the same.
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My 2005 F250 just had the cab off in December for head studs and gaskets. Its a Crew Cab short bed FX4 so it has ESOF. When I engage 4x4 the blower will switch from blowing air out of the vents to blowing air out of the windshield defrost. Is a vacuum line plugged in wrong somewhere, or is one cracked? Trying to figure this out, its rather annoying
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I have a 2012 super duty with a 6.2 in it. I bought it last winter and noticed no air getting to the defrost vents. Now in the heat, sometimes when I turn the air on, all I get is super hot air like the heater. Sometimes playing a bit will work but not always.
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My 1999 F 250 5.4 liter. I know I have a vacuum leak because whenever I accelerate the air conditioning coming from the vents switches to the defroster. So my question is how do I go about finding the leak? My hubs in the front are manual so I know I don't have lines going up there. I do have some mechanical capabilities I've changed water pumps alternators brakes etc. But never anything with vacuum lines or a/c.
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I have a 2008 F350 and there is nothing blowing out of the vents or defrost for AC or heat. It doesn't matter what fan speed is set. Would this indicate a blower motor? Where exactly is it located and how to change?
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My 01 SD won't blow air anywhere but through the defrost vents.
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02 F250 with 7.3. When I activate the 4WD, my light comes on, the A/C quits blowing out of the forward vents and goes into defrost and no 4WD. If I sit and wait a bit, the air again blows out the front vents and the 4WD engages. I figure I have a vacuum leak somewhere in the 4WD system. Is there a common place for this to happen or do I need to trace the whole system down? Also my manual hubs has never been turned and of course they won't. I know better than use a wrench so is there a easy way to free them up or just go ahead and disassemble and clean?
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Air is only blowing through the defrost vents. No matter what I do - try to turn vents, A/C, heat, fresh air, recirculating, etc. Assume it's a switch or fuse issue somewhere. How to fix it?
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I have an 03 f250 6.0 150k milage and lately my A/C has not been working at its best. Its intermittent, and for some reason it will work fine until i get on the highway and it just blows hot air. Would this be a leak or clutch issue? One thing I have noticed if my oil/coolant is above 200 the A/C will blow hot air but not return to cold when the temperatures return to normal. I haven't done any trouble shooting so my first thing ill check are the fuses. As far as the compressor goes its an alien object to me I have never had A/C issues with any vehicle i have owned.
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I have a 2012 F-350 SRW with a 6.7 diesel. The other day I went to push the defrost switch and noticed it does not work. All the lights work in the switches, and the temp control works, but no matter what I push, defrost or floor, it stay in the vent only. Anything I can check??
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Like the title says; I have a 2001 F350 with No blower Motor and Just Defrost, it is actually a friends, he is building a fence, and I am looking into the truck problem. The just defrost is probably a vacuum issue, but I do not have any book for this truck, so I have no vacuum or wiring diagrams. As far as the blower motor, I am thinking switch or motor, fuse has been checked? Is there any other "control" box involved with this year/model? Also any dash tear-out instructions, to make the access easier?
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I have a problem with my vent selector on my truck. It's a 2005 f350 lariat. The vent is stuck on defrost, some times after a few mins I can get it to switch to floor but not always. I have replaced the pump, checked tank for cracks, disabled and plugged the auto hubs. The pump will shut off so I assume it's not a leak. I believe it's in the switching unit, can these be repaired? I found a lot of dust and dirt in the vac tank that had been sucked through a bad hub. I think it may need to be disassembled and cleaned. I have seen videos showing how to replace the orings in the older units. Are the newer style remote ones the same?
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Last Oct. I noticed that my ac/heater started to intermittently stop blowing from AC fresh air/recir/vent/etc. mode and stick to defrost only. Do I have a bad switch and or a vacuum issue here? It's a '01 F350 CC 7.3 .....
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So my vents stopped actuating to different positions in my 2011 6.7 F350. I read that it could be a vacuum pump or solenoid issue. In any event, I turned 4x4 on and went down the street and made a u-turn - 4x4 seems to be on as the truck wants to hop the outside wheel when turning. I want to check the vacuum pump anyway but for the life of me cannot find it anywhere. Moreover, google turns up nothing which is making me start to believe the new trucks have a completely different system.
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2011 F350 6.2L Gas engine. Last fall when I first started using my heat I noticed that the air would only blow through the dash vents. It will not switch over to defrost or floor. I have an XLT I am pretty sure the controls are the basic controls. there are push buttons to change from floor/vent and defrost. I do recall the summer before I had I noticed the problem I would hear a clicking sound in behind the dash. I figured something fell down the defrost vent. I see people who have had this problem on older trucks talking about an actuator. I've looked on ford parts site and I cannot find an actuator listed for the damper door. I was hoping to see what it looks like so I could try and find it in my truck.
I do have the dash pulled apart and I can reach up and manually move a lever that is connected to a cable. and I can change the air outlet to the floor, but I cannot get it to change to defrost. While I have the dash apart I also tried pressing the buttons on the heat control to see if the lever which I am moving by hand is moving at all and it is no. I was thinking if something was stuck in the system I would probably be able to feel the cable at least try to move, but it does not. The white cable which is connected to the lever which I am moving goes into the bottom of the duct work, where it goes from there, but I am assuming some kind of actuator?
This is right in front of the 4x4 shifter
Obviously behind the glove box
With the radio removed
I'm guessing this is 1 of the motors?
I stuck my camera up there to see what was there. This is as far forward as I could go on the drive rside and in front of the 4x4 shifter. You can see the end of the cable I'm assuming that is the door.....
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So the first issue is, if the vehicle is cold (regardless of temp outside) it takes forever to start it. It cranks and cranks and cranks and after a couple seconds of cranking I stop, wait a second, then try again. Usually it takes two sometimes three tries to start it. The guy who I bought it off of said it has newer glow plugs (last year I believe) and also I have replaced the batteries. Once its warmed up it does not do this at all.
Secondly and also something that just recently started happening, my water in fuel light keeps kicking in. I drained the water out of the water catcher reservoir under the truck multiple times and the first time water actually came out but every time after that simply diesel fuel comes out. I added a bottle of water remover to the fuel as well and ran it down to a quarter tank. Then filled the truck up completely, added two more bottles of water remover. The light still comes on. I noticed it only comes on when I am going up or down a fill. When I am driving on flat ground it does not kick on.
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2006 F250 5.4 - While driving ac changes from vent to defrost on it own..let off gas and it will change back to vent. I replaced vacuum can under hood.. no luck.....
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