I've been trying for a long time to track down a gremlin
(or two) in the A/C of my 1986 Syncro GL.  The coolant was
evacuated and recharged and holds its charge fine, so
that's not an issue.  Problem is that  when I turn the
temperature switch on sometimes the compressor comes on and
sometimes it doesn't.  A couple weeks ago the compressor
kicked in as soon as I turned the temp switch on but even
after the van got really cold inside the compressor
couldn't cycle off -- even with the switch at its lowest
setting.  So, we replaced the switch since all the other
relays and such were okay, but it still doesn't come on or
cycle on/off like it should.  Now, here's the weird thing I
just discovered over the weekend:  If I turn the temp
switch all the way on then turn it a bit more (past it's
highest setting), the compressor kicks in!  Is this some
hidden force-the-compressor-on function of the switch that
I didn't know about?  Anyone have any idea what might be
causing me these troubles?  Thanks very much in advance.

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