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Hey guys, so I’ve got an 04 f250 and I went to start it up today and the ac jumped to the defroster right away from max a/c. After changing it from all of the different ac positions I’m finally able to get it to go back to regular vents. I’ve been reading some of the older forums about it and everyone has said vacuum leak or a bad vacuum pump. My question is would I be able to get it off of defroster if one of those were bad? I’d think it would be stuck.

I’m going out tonight to see if I knocked a line loose or if the pump is even giving vacuum because I was under the hood the other day. I had the issue with the ac jumping with 4WD because of my lines to the knuckle are dry rotted so I’ll also plug those off to see. Any help is appreciated!
 
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