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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van SPONSORED BY:

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Old 08-14-2014, 12:49 AM
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AC comes out of defrost vents

So when my ac is on it mostly comes out the dash vents but some comes out of the defrost vents. Like 70-30 I guess. If I am not mistaken it is all controlled by vacuum. Any suggestions?
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Old 08-14-2014, 12:57 AM
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Quote:
Originally Posted by snorindad View Post
So when my ac is on it mostly comes out the dash vents but some comes out of the defrost vents. Like 70-30 I guess. If I am not mistaken it is all controlled by vacuum. Any suggestions?
You are correct, i would check for vacuum leaks.
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.
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(Bryan) 2004 (09/2003 build, call it an 03) F250 XLT 6.0 CCLB: Turbo back 4" MBRP | MBRP cat "test" pipe | XDP EGR delete | ARPs | blue spring | upgraded turbo drain | homemade Baldwin coolant filter kit | Fumoto oil (F-111) and coolant (F-108N) valves | SGII | SCT | Glowshift EGT/fuel pres/boost 3-in-1 | cold(er) AC mod | Zoodad mod | Mishimoto rad

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Old 08-14-2014, 09:18 AM
rocco7869 rocco7869 is offline
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Originally Posted by snorindad View Post
So when my ac is on it mostly comes out the dash vents but some comes out of the defrost vents. Like 70-30 I guess. If I am not mistaken it is all controlled by vacuum. Any suggestions?
The vacuum canister is on the passenger firewall behind the battery. Thats a good place to start.

Chuck
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Old 08-14-2014, 09:20 AM
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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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Old 08-14-2014, 09:22 AM
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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: http://www.ford-trucks.com/forums/13...=blows+Defrost

Last edited by TxMav; 08-14-2014 at 09:24 AM. Reason: Found the link.
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Old 08-15-2014, 05:36 PM
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Thanks for the reply's I will try and check this all out over the weekend.
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Old 08-16-2014, 08:29 PM
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Quote:
Originally Posted by bthr22 View Post
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.
^definitely check the vacuum pump, there was a tsb for it being inoperative or running continuously. I had to replace mine
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Old 08-17-2014, 12:49 AM
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I have some diagrams if it will help.


Click the image to open in full size.

AC 1


Click the image to open in full size.

AC 2 Valve


Click the image to open in full size.

AC 3 EATC


What I don't have is the 4X4 diagram. I'll try and get that up for you later.

Sean Click the image to open in full size.

EDIT : Got the Service info from the workbook for you. One nice PDF for you.
Attached Images
File Type: pdf 308-07A-01.pdf (918.6 KB, 9 views)
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Old 08-17-2014, 08:00 AM
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Would this diagram work for a 04?
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Old 08-17-2014, 08:20 AM
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Some things will be the same. But not all.
I no longer have a 2003~2004 to look at.

Sean Click the image to open in full size.
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Mods Blue Spring, High Idle(BCP), Coolant Filter,SCT from http://www.gearheadautomotiveperformance.com/
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Old 08-17-2014, 08:20 AM
 
 
 
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