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This all started acouple weeks ago when all the sudden the AC decides to just only work in defrost mode. This went on for a couple weeks then it suddenly worked normal for two or three days. Now it's back to defrost only and it ... JOIN NOW TO REMOVE TRACER

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Old 07-17-2010, 04:30 PM
Cowboy Cadillac's Avatar
Diesel Fan


Default Problem: AC only works through Defrost vents, need Help

This all started acouple weeks ago when all the sudden the AC decides to just only work in defrost mode. This went on for a couple weeks then it suddenly worked normal for two or three days. Now it's back to defrost only and it has me stumped.

Being that I have a 2005 F250 lariet all I have are stupid push buttons. There are no manual switches to play with.

Anyone with information on this please let me know..

---AutoMerged DoublePost---

Any body got any suggestions??

Oh Yeah Move to the top

Cowboy Cadillac's Sig: 2005 Ford F250, Crew Cab, Short bed, ARP Studs, EGR Cooler Delete, 4" exhaust w/5" tip Turbo back, Column Guages for Water and Trans. temp, Boost, Fuel Pressure, and EGT's, Power and Leather everything except No Sunroof, and looking good on a pair of 37x12.50 by BFG...Got My SCT Now Just waiting on $ for some Custom Tunes

Last edited by Cowboy Cadillac; 07-17-2010 at 04:30 PM.. Reason: Automerged Doublepost
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Old 07-18-2010, 07:11 AM
scrotom's Avatar
Diesel Enthusiast



check your hose connections under the hood. small black manifold on passeger fender

scrotom's Sig:07.5 GMC sierra 2500HD ccsb, egr delete pipe, efi, diamond eye exhaust.
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Old 07-18-2010, 10:25 AM
Diesel Bomber



I've had the small vac pump stop working. It's located on the top of the pass side wheel well. I gave it a tap and it worked until I could get a replacement.
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Old 07-18-2010, 11:32 AM

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Default Re: Problem: AC only works through Defrost vents, need Help

A vaccum line is off
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Old 07-18-2010, 05:41 PM
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How about your blend door motor? Most automotive heating/cooling systems have a door with an electric motor attached to it that allows to vents to switch between cold air in the hoses to hot air in the hoses. Try switching from heat to AC a couple times and stick your head up under the glove compartment. The blend door is directly under the radio on our trucks i believe. If you hear and electric motor actuating then you know your door is stuck and you can fix that by stripping it down and lubricating it. If you don't hear that electric motor cycle then its time to start stripping the dash!

6.0 kiddo's Sig:2004 Ford F250 SuperDuty 6.0 auto - 207,xxx on the clock, Dynoed at 395hp 732 tq. at the rears Daily driven, does a decent amount of towing and hauls a bunch of college kids on a daily basis!
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Old 07-18-2010, 09:33 PM
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Status: 6.0 powerstroke masochist



Definitely a vacuum leak. Mine is doing the same thing when switching it to 4x4, and my auto 4x4 doesn't work. It's a vacuum leak.

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Old 07-20-2010, 07:52 AM
Cowboy Cadillac's Avatar
Diesel Fan



Ok, its Tuesday morning and still no luck on the A/C problem... For some reason I spent my one day off running the tractor, weedeating, and taking off the trash instead of tinkering on the truck So Thanks to everyone who has helped me out with suggestions so far. Maybe I'll be able to get to it this weekend
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Old 07-23-2010, 08:40 PM
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Status: rolling coal


Let us know what you find my 07 is doing that too, but being Over the Road I dont get to see my F250 very often.

Stumblefoot's Sig:Stumblefoot Hot shot
2012 F450 SD DRW, ez down tailgate, B&W turnover ball, GO Industries brush guard. AFE cold air, Bullydog programmer. ATTA 90 gal aux tank
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Old 07-24-2010, 09:05 PM
Diesel Fan


Default Just had mine fixed-2004 F250 6.0

My hubs would not engage on the fly to 4wd and a/c through defrost. Thought I had a vaccum leak somewhere down by the hubs so I put on Warn Gold hubs anyway as I do not need ESOF. Dealer replaced the a/c regulator I think they called it (in the engine compartment, passenger side, kind of like over the wheel well). All is working great! Hope that helps before you search all over for another leak as I did!
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Old 08-20-2010, 02:24 PM


Default Same Problem with Defrost ONLY air

Can someone shoot a pic of the part that you found needing replacement ? Seems to be a air control valve issue which, as you know, is related to a vacuum problem. Thx
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