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Hi all. I'm currently working with a new 06 e350 w/ 6.0 powerstroke. The issue I'm having is the a/c is not switching on. It has a new compressor, cycle switch and cutoff switch. Charged to specified weight for ambulance package of 3.38 lbs. Since the stealership won't come off a diagram for the system , can someone please direct me to one somewhere. I know there are several things that can cause the pcm to shut the a/c down. I just don't want to go in stabbing blindly.
AutoZone has free schematics you can download---have to trade an email address for access though!
Sounds like you know a bit about repairs so let me suggest getting yourself a factory EVTM. Since they're a bit specific to your year chassis (but include most all engine wiring diagrams too) eBay is a great source. I'm guessing you could find one in great shape shipped for $25 or less, EVTM alone that is.