Have an issue with the air con compressor on my mk3 tdci, it seems the compressor clutch is not working, not sure on gas pressure and believe if the pressure is too low the compressor disables.

Where is the pressure switch so that i can short it to test compressor ?

Also what is the terminal connections for the compressor clutch so that I can give it 12v and check electrics before i swap the compressor for another.

thanks