pfkb, I think the "cam" belt referred to would be the serpantine belt maybe? Seems to be many different words for the same thing, depending on country. Wouldn't it be great if we all spoke the same bastardised version of english???
With regards to cruise control not working, this is common, loss of pressure, but an easy fix, the pipes tend to wear where they connect. Just cut off an inch and reconnect seems to be the easy common fix.
I am not sure about the radiator issue, I haven't heard that one, maybe someone with more knowledge can address that. My truck does not have the original radiator, but I do not know when and why it was replaced. Do a search on discoweb.org, there has been much radiator discussions, usually as a result of overheating though, not from parking the truck for months.
One thing to check is sludge build up in the engine. See this site.
http://www.rpiv8.com/engine-4.htm#inside
