These may already be on the site somewhere, but I haven't found them (yet), so maybe just point to them or a link, if they are already covered;

Cruise control rebuild, or typical fail points, including C/C amplifier (?)
where is it, what does it look like?

Climate system controller

A/C distribution valve, where is it, what does it look like?

Thanks, looking forward to this, since I have an 85 300TD, 278K

Bob Bush in Lou. Ky.