First of all, to replace the high-pressure switch, you can disconnect the negative battery terminal. Unplug the connector from the AC pressure switch, located on the high-pressure line above the condenser or near the
Coolant Reservoir. Unscrew the pressure cycling switch using a backup wrench to avoid damage. Lubricate the switch 0-ring with clean refrigerant oil. Screw the new switch onto the line until the screw is hand-tight, then tighten it securely with a backup wrench.