I need to get to port on accumulator but cant coolants is blocking  can I loosen coolant bottle for room or do I need to remove bottle,yes this is a r-12 system,no I am not going to update to r-234,problem is ac comp doesn't go off runs all the time with ac on   cause mybe low coolant level  I need to check this frist   ac works fine always has  .how to I get to coolant bottle.thanks  dwa

Definately check the system first for correct pressure.  If it runs all the time (when its turned on) and blowing cold air, then i dont really see a problem...however, if its icing up, creating ice on the lines near the evaporator, or backside of the compressor, then there is probably a refrigerant level issue,or blowing hot air and the compressor is turning then the pressure switch may be at fault..... if its all good, the compressor will run all the time when the clutch is activated(turn on a/c or defrost in cabin)....  pressure-wise, with a set of gauges the low side(suction side, usually near the evaporator) should run in the neighborhood of 30-35 ish psi....   if it falls below around 26 psi the pressure switch will deactivate the power going to the compressor's clutch, stopping the compressor....

I cussed GM every time I had to hook up to the port down there.  It did some good as on the '74, they moved it up in line along the fender.  May do that when I put mine back together.

you are correct  problem is getting to a/c port,every items check but coolant level   has anyone have a idea how to get to this port.