So your main problem is no ac right? If there is no charge in the system the clutch won't engage. The other problems I'm not real sure about, some could be bad connections, others like the center vents are probably vacuum problems.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k