Ford Super Duty (1999-2016) :: F250 - Dash Vents Stop Blowing Under Acceleration
Jan 5, 2014
My heater vents have been acting up. I have read that there may be a vacuum leak that causes the blend doors to default to defrost...
Where the vacuum line fails? I have ESOF 4x4 and that is still working. I think there may be a correlation between engine vacuum and my vents: at cruising or idle the vents work ok (not perfect) and under acceleration (less vacuum) the dash vents stop blowing.
I thought that the blend doors had their own vacuum pump, so I do not know why things change at different amount of throttle?
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I have a f250 with 6.8l engine. I can get air thru the defrost and to the floor, but no air thru the dash vents on me. I have traced all vacuum lines and they seem fine.
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My 2006 F-250 (6.0 Diesel) started blowing black smoke under acceleration yesterday. It has 181k miles on it now. No loss of power, no rough idle, no smoke unless there's a load on the engine like accelerating, but then it doesn't matter if it's 1500 or 3000RPM, just the higher the RPM the more smoke it blows from the exhaust, dark black.
The truck has ARP headstuds, no programmer. Replaced both batteries and the A/C system about 2 weeks ago. About 3000 miles ago it got new glow plugs & harnesses, new alternator, all fluids changed, new aftermarket EGR cooler, new EGR valve, new turbo & actuator, new EBP sensor, new HPOP incl pipes and IPR.
Trucks starts up just fine, runs normal, just yesterday going down the Freeway about 65mph I noticed it started smoking black going up a hill, then smoke went away going downhill... Now every time I accelerate it's smoking black. Taking off from a stop sign it made a little puff of white smoke then went back to black smoke, but that only happened once.
Where I should start looking? No codes so far. But I have an AutoXRay EZ-Scan 6000, what sensors do I need to look at?
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Am I the only one who thinks the tire pressure monitoring system is a silly feature? Is there any way to delete this and stop the light from coming up on the dash? I want to do new wheels and tires on my 2008 f250 and I don't want to deal with the tpms. Can it be tuned out from the computer?
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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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I seem to be having a run of bad luck with my dash vents. 3 of the 4 vents in the dash have broken and I would like to replace them.
Are these vents made aftermarket? If so who? The dealer wants fifty some odd dollars each.
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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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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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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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1999 ford superduty keep blowing the 30 amp fuse under the dash, want let it start, why this is happening and the cause of it.
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Last week I flipped the fan switch on and noticed that only hot air was coming from the vents, even with the control set to AC. The vent control switch seems to work fine directing the air but only hot air. The temperature control does not work. The exception is when I put it on max AC I get cold air. I can't be the only one.
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So I got in my truck yesterday and i started it like normal and turned air on. The air will not blow out of the vents but only the defrost vents. I have checked all vacuum lines and good, my 4x4 engages and no issue with it locking in. I am Puzzled on what it could be?
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I have a 2005 Ford F-250 Diesel 6.0 my ac works fine but after working a while the air quits coming out of the vents. It happens every time I go on a long trip with the ac or heater. Is like if a duct damper closes because I can hear the motor blower going. The entire ac system is new but it was doing this with the old system....
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1999 F250 7.3 4x4 switch on dash with manual hubs. No visual vacuum hoses cracked.
Not sure what this component is but when I wiggle the wire at the orange cap a small motor kicks on.
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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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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 2002 F-250 7.3 Powerstroke 4x4. My truck has developed a "clunk" for lack of a better term when accelerating from a dead stop. It is not a shudder as it only happens once within a few seconds of depressing the accelerator and then goes away until the next time I stop moving.
It feels like either something in the drivetrain is not engaging right away, or something is releasing, like a stuck caliper or something. From the way it feels and what I've read so far about the TC/Trans, I'm assuming it is something worn in the drive-shaft/rear diff.
But it needs brakes badly (already have all new rotors & pads ready to install) so maybe a caliper is sticking when depressed and then popping loose under initial acceleration? I think this is unlikely but possible.
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I have an 01 f250 5.4l standard. #19 fuse keeps blowing. I hAve taken the gauge cluster out and do not see any wires melted or burned. It blows the fuse as soon as I turn the key over. I have read things saying the overdrive but that doesn't work with mine.
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The A/C on my 05 F250 6.0 recently would not blow out through the vents. So, I replaced the vacuum pump and the reservoir tank. Once I replaced them the A/C still starts through the defrost vents but, after a minute or so starts to blow through the vents. I also noticed that the vacuum pump never stops running. Is this normal or is there something else I need to look for?
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Got a 99 V10 blowing a lot of oil out of the exhaust pipe, to the point where I could fog the neighborhood, cylinder number 10 had original spark plug dirt down in the hole know one wanted to clean it out so I did put new plug and coil now smokes a lot, also truck has 173559 miles, did a half diesel half used motor oil flush tonight, wanted to go for 15 minutes only made it to 14 to much smoke, will put fresh oil in tomorrow, what could be the problem, piston ring blow by, intake manifold leak, burning what I think is oil could be coolant, head gasket no bubbles in oil or antifreeze and antifreeze and or oil are not mixing. Is it easier to pull the heads off with pulling the motor which looks fairly easy or leave it in the truck.
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2001 F250 5.4. The heater will blow warm air at idle and on the second highest setting, once you start moving or turn the fan up to full blast it instantly cools off. The coolant level is fine. The engine runs at a normal temp.The blend door does work. I just replaced the thermostat, and both hoses for the heater core are hot.
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