Symptom:  Turn A/C on and inside blower runs but just a click from a relay
on rear wall and no compressor or front condenser fan.

History:  system is stock R-12.  A/C has worked fine last 3 yrs. seems to
want a recharge every 3 yrs.  Late last summer, went in for a recharge and
noticed the work was done without evacuation containment equipment, just a
guy with gauges and a can of freon.  He seemed confident with his work but I
have seen this work done with the evacuation equipment that allows
refrigerant charge to be removed, vacuum on system to check for leaks then
recharge with proper amount of oil and refrigerant.  I always carry the
Bentley to the A/C guy since the system holds more than what most are
accustomed to and this helps convince the tech to pump in the 5 lbs. or so.
The van was finished, buttoned up and I was on my way.  3 days of good A/C
and the system quite working.  Now I just get this click from rear
electrical wall when engaging the A/C, inside blower works but no compressor
or A/C condenser fan up front.

Question:  What's wrong here?   Overcharge?  Can I jump around the high/low
pressure cutoff to check system operation?  Any thoughts?

TIA

JB -getting warmer in SW Missouri