I'm a few short steps away from reviving my Behr A/C system in my van.
It's one of the ones mounted in the dash. When I bought the van there was
no compressor and the hoses at that end were not sealed up in any way. I
was about to take a stab at flushing the lines out this afternoon, but
thought it better to do a bit more research. Is it necessary to flush the
system at all? I would love to just vacuum and charge.  If so, would I need
to avoid flushing the expansion valve, my new dryer or any other parts?

Any advice would be welcome.

--
m.