See, you do not know if the harness has been replaced, if the A/C was just charged for a quick sale, etc I owned a similar car for years, my old E32 750iL...the W140 will spend quite a bit of time being wrenched upon.
A $1000 W140 sounds like a nightmare just waiting to occur. I would scrap that bad 560SEL and find a nice 420SEL if he wants a gasoline powered S-class as the W126s are pretty simple to operate upon. I had to change the ASR/TB unit once on a W140 and was not a fun experience.
But hey, this is my opinion and everyone has one.
