Cool-ish air seems to be actually coming out of the vents, however only when accelerating.
The main issue seems to be that the digital display for the Air Condition does not come up at all, none of the buttons light up and hitting them doesn't seem to do anything at all.
I just recently had it in for its regular service, not more than 2 weeks ago and I do have an aftermarket deck with an ipod connector. I am wondering if the issue is not just a simple wiring problem stemming from my aftermarket equipment.
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In f150 truck there is a small vacum hose passenger side up by the windshield. It's a small hose check really good they dry rot and it will cause your vents to switch. Also if your box is bad. It's next to the battery
You answered your own question. It definitely sounds like a vacuum problem. Now the question is, how to find it! It sounds like the problem is under the hood, and may also be related to the ABS fuse... check the fuses under the hood first... then listen for the sucking sound of a vacuum leak. Sorry I can't be more specific!
that switch controls a vacuum operated door that lets a/c or heat thru.when accelerating,the vacuum in the engine changes so it sound like a vacuum issue.take apart the center stack and there is a vacuum actuator in there connected to the flap door .i have seen those have issues with the metal tab broken away from the plastic that moves it.is the a/c piping cold under the hood where it goes into the heater a/c assembly?the compressor should be cycling on and off and the pressure tested.