A safety Switch that monitors the pressure of the refrigerant. A/C Safety Switch. Auxiliary A/C. When replacing Switch assembly a new wire harness is required. When replacing Switch assembly, a new wire harness is required. When replacing the clutch cycling Switch assembly a new wire harness is required. When replacing the clutch cycling Switch assembly, the wire harness must be replaced. When replacing the Switch assembly a new wire harness is required. CONDIT. System - V. Conditioning (A/C) Safety. HVAC Pressure. Vacuum. Included with: Accumulator.