Compressor control
WARNING: This page is about a different car, the 2004 Land Rover Discovery, 2003 Land Rover Discovery, and 2002 Land Rover Discovery. However, it is still accessible from the selected car via links, so may be relevant.
To engage the compressor clutch, the ATC ECU outputs a compressor clutch request to the ECM, which then energizes the A/C compressor clutch relay. Compressor operation is governed by the evaporator outlet air temperature, at one of two settings, dependent on the amount of cooling required. When more cooling is required, the compressor clutch request is output if evaporator outlet air temperature increases to 4 °C (39 °F) and cancelled when it decreases to 3 °C (37 °F). When less cooling is required, the compressor clutch request is output if evaporator outlet air temperature increases to 11 °C (52 °F) and cancelled when it decreases to 10 °C (50 °F).