Aircon- compressor clutch not being activated

*ROFL*

At the risk of inviting unsolicited comments from deluded idiots peddling crap, I'm resurrecting this thread as an update.

Update part 1.
R24 gas is available locally, and I'm going to use this to recharge one of my 3 V8s
The compressor clutch initially wouldn't engage, and it appears that both high and low pressure switches are not working correctly. By temporarily shorting them out, the compressor runs. Yeehaa.
So next is to get a full charge of gas in there.

Maybe I should replace the associated valves sitting behind the switches?

Update part 2
My niece is actually much older, and rarely listens to me, let alone repeats what I say.

I got some life from the system. The low pressure switch is not working. With a positive charge in the system, the lo-press switch remains open..
Short the switch, the clutch operates.

...and then the pump bearing goes.
So I pull the pump out, and try to get to the front bearing. With the shaft nut removed, the clutch should pull free. But it doesn't. What's the secret?

just replying to bump this up, in the hope that someone might know how to get the zircon pump pulley assembly apart.
i now have two pumps, one with a good pump and knackered clutch. The other has a good clutch, and damage to the pulley.