Compression Ignition Addict
Join Date: Jan 2011
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well I think you have it narrowed down to the two most likely problems, the head unit (an electric problem) or a sticking solenoid on the blender door.
Since it started after you unplugged the head unit, and that was because the system was not working, that is where I would start.
You might try the simple solution first. remove all power from the truck, and unplug the A/C unit. leave it sit at least 30 minutes to clear any memories and hopefully get the A/C head unit to reset.
05 F250 King Ranch crew cab - bone stock for now, new to me April 2013, 56K miles
05 Volvo S60R, 300+ hp and AWD
09 Audi A4 Qautro 2.0T, AWD and 30 mpg!
06 Malibu LSV Wakesetter, 383 stroker
13 Coachmen 320BHDS - 10K lake house on wheels
81 Jeep CJ-8 (in progress); 5.7 HEMI; LJ (extended) frame, 3.5 RE lift, flatty fenders