The climatronic system on that car is not so difficult to fault find, if you where near me i reckon i could give you the cause/fix in 30mins or so.

As Nick has stated, it has a trinary pressure switch, they leak through the switch into the wiring connector, actualy pressuring the multiplug onto the switch.

I could go on, but something for you to look at. by powering the compressor you have already told me the clutch is ok, and the compressor can generate high pressure, though by running it without fan control you have overloaded the system and the compressor blow off plug has blown out hence the refridgerant, big fan for knowingly releasing refridgerant to the atmosphere mate.