The only 2007 and older models equipped with accumulators utilize A/C Compressor Cut-Out Switches; later models with receiver/driers do not utilize A/C Compressor Cut-Out Switches. The A/C Compressor Cut-Out Switches, located atop the accumulator, measure pressure in the low refrigerant line. They activate at a pressure of 22 to 28 psi and deactivate at 40 to 47 psi. If the pressure exceeds 550 psi, the pressure cut-off switch located in the high-pressure line between the compressor and the accumulator will switch off the system. A Schrader valve located in the accumulator prevents refrigerant loss when A/C Compressor Cut-Out Switches are replaced. First, unplug the electrical connector from the A/C Compressor Cut-Out Switches mounted on the accumulator to replace the switches. Next, remove the switches from the accumulator. Afterwards, lubricate the switches' O-rings with clean, appropriate-type refrigerant oil. Next, screw the new switches onto the accumulator threads until they are hand tight and then secure them. In the end, reconnect the electrical connector(s).