High Pressure Sensor / Switch: Service and Repair

WARNING: REVIEW THE WARNINGS AND CAUTIONS BEFORE PERFORMING THE FOLLOWING OPERATION.

REMOVAL
1. Recover the refrigerant from the refrigerant system. Refer to Refrigerant Recovery for the proper procedures.
2. Disconnect and isolate the battery negative cable.
3. Raise and support the vehicle.

Fig.57 High Pressure Cut Out Switch Location:

4. Disconnect the engine wire harness connector from the high pressure cut out switch on the compressor back cover.
5. Using snap ring pliers, remove the internal snap ring that secures the high pressure cut out switch to the switch port in the compressor back cover.
6. Pull the high pressure cut out switch out of the compressor back cover.
7. Install a plug in, or tape over the opened switch port on the compressor back cover.
8. Remove the rubber O-ring seal from the high pressure cut out switch and discard.

INSTALLATION
1. Lubricate a new rubber O-ring seal with clean refrigerant oil and install it on the high pressure cut out switch. Use only the specified O-rings as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the compressor in the vehicle.
2. Remove the tape or plug from the switch port on the compressor back cover.
3. Insert the high pressure cut out switch into the switch port on the compressor back cover.
4. Using snap ring pliers, reinstall the internal snap ring that secures the high pressure cut out switch to the switch port in the compressor back cover.
5. Reconnect the engine wire harness connector to the high pressure cut out switch on the compressor back cover.
6. Lower the vehicle.
7. Reconnect the battery negative cable.
8. Evacuate the refrigerant system. Refer to Refrigerant System Evacuate for the proper procedures.
9. Charge the refrigerant system. Refer to Refrigerant System Charge for the proper procedures.