AC comes out of defrost vents
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The nice thing is, the climate control and hubs are ALL that is vacuum controlled. My F150 had a vacuum leak that made it run like junk, took me months to find.
I hear the hub lines are a common spot for the leaks.
#3
Chuck
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#5
Also, the little valve on the passenger side near the firewall behind the oil fill cap. It's black and a little bigger than a golf ball. The hose fell off of it on my truck and caused the same symptom. Easy fix. Just find the hose and reconnect it to the valve.
Search for this thread, it is helpful too. 'AC blows out Defrost'
This thread: https://www.ford-trucks.com/forums/1...=blows+Defrost
Search for this thread, it is helpful too. 'AC blows out Defrost'
This thread: https://www.ford-trucks.com/forums/1...=blows+Defrost
Last edited by TxMav; 08-14-2014 at 08:24 AM. Reason: Found the link.
#7
http://youtu.be/6F96gOhTBEI
You could try this little adjustment on the vacuum pump. I have yet to try it on mine. If that doesn't work, the pumps are relatively inexpensive to replace.
This is assuming you don't have a vacuum leak anywhere else.
You could try this little adjustment on the vacuum pump. I have yet to try it on mine. If that doesn't work, the pumps are relatively inexpensive to replace.
This is assuming you don't have a vacuum leak anywhere else.
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#13
Old thread back from the dead but good information!
If your vacuum lines have a leak anywhere or your truck has ESOF 4wd and the hub seal or seals are compromised you will also not build vacuum and the hubs won’t engage and the vents will default to the defrost mode. I deleted my vacuum lines to the hubs and installed manual Warn hubs.
If your vacuum lines have a leak anywhere or your truck has ESOF 4wd and the hub seal or seals are compromised you will also not build vacuum and the hubs won’t engage and the vents will default to the defrost mode. I deleted my vacuum lines to the hubs and installed manual Warn hubs.
#14
The same problem of AC only coming out the defrost vent started for me today. Followed the ideas in this thread and found what appears to be a snapped vacumn line in the engine bay.
https://ibb.co/R0Y57Bv
What is the easiest fix here? Is there a two ended nipple connector that I could just use to reconnect the line?
Anyone know the part number?
https://ibb.co/R0Y57Bv
What is the easiest fix here? Is there a two ended nipple connector that I could just use to reconnect the line?
Anyone know the part number?
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