Air Conditioning (A/C) Clutch

DESCRIPTION
The air conditioning clutch is an electromagnetic clutch that is energized when the clutch cycling A/C pressure cut-off switch closes. The A/C pressure cut-off switch is located on the suction accumulator-drier. The closing of the A/C pressure cut-off switch completes the circuit to the clutch and draws it into engagement with the compressor driveshaft. The A/C pressure cut-off switch is used as an input to determine electronic pressure control when the air conditioning clutch is engaged to compensate for the additional load on the engine.

SYMPTOMS
Failed ON - electronic pressure control slightly low with A/C OFF.

Failed OFF - electronic pressure control slightly high with A/C ON.

DIAGNOSTIC TROUBLE CODES
539, P1460, P1463, P1464