[Shotimes] New AC Question, suddenly quit

[Bill Murray]

About 2 weeks ago I noticed that the AC seemed a little humid all of a
sudden and I could smell the humidity.  My guess was it was about 5
minutes, maybe less, that it took me to realize that the AC wasn't cold
anymore.  I turned the AC off and put the windows down.  15 minutes
later I tried the AC again and it was nothing but hot air, and hasn't
been any better since.  My AC has been nice and cold until this point.  
 
I first thought that maybe I was low on R134a, but I kind of doubt it
since this literally happened within a 5 minute period or so.  My car is
a 93 thats been retro'd, but I have no idea whats been changed or not
changed, it was done by a previous owner.  I'm going to borrow a friends
refilling kit to see what the pressure looks like, but I was hoping for
a few other ideas of things to check.  Could the AC clutch just stop
working all of a sudden like that?  I'll be checking the gap on it and
also try the broomstick bump to see if its engaging.  I also considered
the coil, but when I had one fail on another SHO, the entire thing
seized and tore my belts up.  
 
Might there be a problem with the pressure switch?  I'm hoping there is
an easy solution, I don't want to have to find an AC shop around here,
and I'd like to get this fixed while its still hot out.  Any other
trouble shooting tips or ideas?
 
Bill Murray
SHO owner, sometimes HOS(Hunk Of Shit) owner

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