First I go into the car and ensure the Air con is on and the blower is on at least halfway, I now check the compressor to ensure the clutch has engaged and that the pulley is turning the compressor. If the compressor is on and working you can assume the electrics are pretty much good.
If the compressor does not on then you need to fault find.
Firstly id check the pressure in the system as without pressure the pressure switch will not allow compressor clutch engagement.
If pressure is good id now look for the relay that controls the compressor clutch operation you can test the control side of the relay for power and ground if you have both you can be assured that all the controls in the car are fine if not you need to look at the climate control panel internally, these can be replaced as one unit.
Now you can test the load side of the relay which is the compressors clutch, you can load the circuit with 12v to see if the clutch operates if it does its all fine if not you need to replace the compressor clutch solenoid. see our post of this here
The 3 wire pressure switch ( see our post on these here )
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