Could anyone tell me how I locate the A/C pressure switch and how to by pass it to check if low pressure is a problem in my system.

Thanks

 

Not without knowing the specifics on your vehicle. Model? Year? Engine? Details are your friends...

What is not working properly in your A/C system?

 

Type of vehilce: 4Runner, 1996, V6 petrol. Basically the compressor seems okay as the drive wheel works. Haven't tested the clutch but I'm thinking it may not be operating due to the pressure switch if the system needs charging. I have the A/C switched on with motor running and fan on.