1) This is for the test solenoid on the overspeed governer.
2) This is for the solenoids in the vacuum lines going to the safety and outflow valves, and has nothing to do with the flowpacks. If electrical power to these solenoids is lost, nothing happens in flight. The pressurization controller will still get vacuum from the system and will still control the outflow valve, and the safety valve will stay closed. All you lose is the ability to dump the safety valve.
A note on flowpacks. The old alcohol still style ones will close with a complete electrical failure, causing a complete loss of pressurization. The newer ones with stepper motors will simply stay in whatever position they were in when the power failed.
3) Yes, the clutch will fail open and no more air conditioner.