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Old 04-11-2012, 02:54 AM
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A/C Question of my 2007 F-350

In my 2007 F-350 I have the digital climate control stuff. My question is this. Sometime when I get in the truck and its hot the A/C blows out like its on defrost and then after a while it will switch to blowing out the vents like it should. Even if I hit the button on the dash to make it blow out the vents it will continue blowing like on defrost.

It sounds like a vacuum issue to me but was wondering if anyone else has had this issue and what you did to fix it. I would like to try and trouble shoot myself rather than taking it to the dealership. Someone mention a vacuum canister but there is just so much stuff under the hood of the truck I don't know where to even start looking for it.

Anyone that can help please reply. Thanks!!!!
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Old 04-11-2012, 05:19 AM
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yeah that happened to me also when I put in my coolant filter. I knocked off a vaccum line in the process. Once back on it was all good to go though. Have you looked into your esof lately? I've heard they will leak and cause this problem to happen also.
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Old 04-11-2012, 05:38 AM
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I recently had the bullet proof egr put on and also the ARP Head Bolts and MBRP 4 " Exhaust and i figured a line was knocked off in the process I'm just not sure where to even start looking for it.

Also what is the esof. Not sure what that is or where its located on the truck.
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Old 04-11-2012, 07:52 AM
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Here is thread that is going on now about a similar issue:

Climate Control Problems

esof = Electronic Shift On the Fly. It is your 4wd system. The automatic hubs are locked and unlocked using vacuum pressure
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Old 04-11-2012, 08:13 AM
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ok I know the 4x4 works as I used it the other day
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Old 04-11-2012, 08:20 AM
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If the hubs function properly, then I doubt you have a vacuum issue. To check for sure, turn the key on in your truck and go listen to the vacuum pump, located on teh pasenger side ove the wheel well, under the hood. It should run for a little bit then shut off. If it runs continuously, then you have a vacuum leak.
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