Ford Super Duty (1999-2016) :: A/C Blows Form Defrost Only - Vacuum Pump?
Jul 10, 2013
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 bought a used 99 f250 v10, i went to turn on the a/c today, and it only blows where the defrost is toward the window. it gets cold after awhile, but nothing out the vents, the heat either.
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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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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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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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My F450 2010 class C motor home has the V10 engine. In the RPM range of about 2200 - 2300, there is a screeching sound I believe is from the engine area. It does not matter what transmission gear I'm in thus the vehicle speed is not a factor - only happens in that engine RPM range. Seems to happen when slowly accelerating or decelerating through the 2200 - 2300 RPM range or continues to screech if I maintain that RPM. If I drop back or increase RPM out of the range it quits. If I accelerate thru the range a little quicker it doesn't happen. Also does not happen when parked and the engine is sped up.
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2003 F350 4.4 5.4L auto. The front hub assemblies, seals, axle ujoints and upper/lower ball joint were all replaced. I bought all the parts gave them to the mechanic and told him if there's problems call me. I took a week off went to MS and he never called. I go to get truck he tells me, the bearings in the hubs are not spinning freely causing the axles to spin. I checked the hubs they are in the unlock position (Warn manual hubs). Originally auto hubs. Now i have the whole front diff spinning and the front drive shaft is spinning too. Clacking and clicking from the front wgen driving. Oh he said the front drive shaft ujoint was bad also. I paid $600 to have it all replaced and i get it back wrong. Is there something i need to check on the hubs that he maybe did wrong? Or is it possible i was sold the wrong hub assemblies?
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Where this small leak coming from. Under my radiator hose. Took a pic of the leak.
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Got the new truck on Monday and I am trying to figure it all out
The mirror defrost comes on with the rear window defrost, my question here is does the defrost image on the mirror light up when on?
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I have followed the vacuum lines but don't see any holes or cracked lines. I dont have the ESOF hubs so that is ruled out. Also checked the connector on the vacuum pump to make sure it still had power. Everybody says that when I turn the key to acc I should hear the vacuum pump running. I don't or do I feel it moving. Am I on the right track? I don't want to replace if not bad. Do all vacuum pumps run on keyed power? I honestly don't remember hearing it run before but that doesn't mean anything with my memory.
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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 husband and I have 3 Excursions, V10, 6.0, 7.3 and I have a 6.0 250 crewcab. 3 of the 4 now blow air or heat from just the defroster unless your going at a slow speed.
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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 a 1999 F 250. When I accelerate my AC from the vents changes to the defrost. Other than that it works great and is ice cold. Why it's doing this.
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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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I have a 2000 f250 4x4 7.3 diesel. I had problems with my a/c and controls for sometime now. my a/c was blowing threw the defrost vent. I was told my blend door was bad. I bought a new blend door installed it,still doing the same thing. I was told to check my vacuum lines. I check them, they were bad. I replace my vacuum lines and my vac pump as well. that fixed my problem blowing threw the defrost vent. I can control my air flow from floor,dash vents and defrost vent. the problem I have, I not able to control my temperature when I turn my center from red to blue. It blows hot air and the air that is coming out of the vents isn't very strong at all.
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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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