AC stops while in 4WD - Ford Powerstroke Diesel Forum

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post #1 of 6 Old 09-13-2012, 07:15 PM Thread Starter
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AC stops while in 4WD

Hi all,
Odd occurrence here. While traveling the trails at the farm this week we lost AC. As soon as I put the truck in 4W High the AC and Blower cuts off. Even on Vent, nothing blows. Anyone ever had this happen? AC is certainly nice while riding the farm and checking on everything. It did pop back on a few times when I hit 15mph.

Also a side note- its time for new shocks. I don't want to lift the truck, it works for what we need. Would appreciate recommendations on replacement shocks/struts etc. We don't haul much weight, just the John Deer occasionally and we have a slide in truck camper, but it only weights 1200 lbs.

Thanks all!
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post #2 of 6 Old 09-13-2012, 07:28 PM
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It is designed that way to maintain optimal engine operating temperatures.

2004 F-350, 4x4, SC, LB, 6.0PSD, 6spd
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post #3 of 6 Old 09-13-2012, 08:25 PM
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Sounds like you have a vacuum leak going to your front hubs, do they lock in automatically or do you have to manually lock them to make them work?

The vent system will only operate the defrost if there is a loss of vacuum, and since you notice the change when you shift into 4wd it is probably one of the vacuum hoses going to the hubs, or it could be a bad hub seal.

2005 F-250 CC/SB 4x4 medium wedgewood blue

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post #4 of 6 Old 09-15-2012, 01:02 PM Thread Starter
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Thank you for the reply's. I will look into the vacuum theory. Will be nice having AC when it is 100+ out there!
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post #5 of 6 Old 09-15-2012, 01:05 PM
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I've never heard of the AC being shut off in 4wd.
The vacuum issue will still let the AC compressor work and the blower will still blow, but only in defrost mode.

As for shocks, Bilsteins are always a popular option.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
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post #6 of 6 Old 09-15-2012, 01:47 PM
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this is a simple fix. yes it is a vacuum issue but 99 percent of the time it is a tiny little hose that hooks up just under the hood. often when engaging 4WD it will pop the hose off.
pop the hood and towards the back of the motor to the left of the turbo there is round circle about 2 inches wide and in the dead center there is a very little inlet that a little grey hose hooks onto it probably popped off and is just laying on the top of your block. i put some red lock tite on mine and never worried about it again. though i do not recommend lock tite cause now i can never take it off haha. good luck let me know if this fixes the problem.


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