Normally when you fill an empty system, you need to jumper the wires that connect to the pressure sensor on the dryer bottle to get the compressor to come on.

Can you jumper that connection and see what kind of high and low side pressures you are getting?

I fear you may have a giant leak and the R134 went right on through.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe