After starting, the air is coming out of the windshield vents for several minutes even though it is set to come out of the other vents. It slowly changes to the selected vent after several minutes. The problem seems to be getting worse
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Re: F250 superduty a/c problem
Sounds like a vacuum problem, you didnt specify gas or diesel, on gas engines the hvac doors work off of engine vacuum, on diesels they have a seperate vacuum pump on the passenger side fenderwell, another place damage to the vacuum line can occur is under the glove box near the passenger kick panel, it could also be a control head problem. -Jared
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Check your shifter linkage, Since they will only start in P or N , Your shifter position sensor may just be knocked out of place or stuck in 5th gear position, even though the shifter is in P ( It used to be called a starter nutrueal safety switch)
I had a problem with vacuum in my F250 diesel. It had a new vacuum pump but would kick out of cruise control every time the vacuum pressure dropped. It turned out to be the vacuum reserve cannister had holes in it.
Seems you reach a tipping point and then all the vacuum systems mess up. You might want to check the reserve cannister and any vacuum servo your 4x4 might have. You can check most of the vacuum stuff with the engine OFF using a vacuum pump. You could have a leaking vacuum pot operating the ductwork. Check your diesel vacuum pump for output and loose belts.
Sounds like you have a broken vaccum line or gasket for the HVAC system. These malfunctions can be very hard to diagnose by your average do it yourself mechanic especially with the maze of ducts and vac lines in newer model vehicles. If your cruise works correctly then more than likely it is a bad gasket. Check the air intake by the windshield on the exterior of the vehicle especially if you have a cabin filter, and also along the face of the firewall where the vacuum lines enter the cabin and sometimes break from rubbing on the surface. I believe starting in these places will give you a good idea whats going on.
Your cain filter is located under the windshield wipers. My brain cannot think of the name of the plate. But the black plate that the arms of the wipers are attached to needs to come off with torque screws and then once that panel is removed you will see a box saying cabin air filter