Air Conditioning (A/C)

Air conditioning (A/C)




The A/C relay (2/22) is activated if the A/C switch is pressed, the blower fan is operating and the engine control module (ECM) confirms it. Power is supplied to the A/C compressor solenoid clutch (8/3) and the cycling of the compressor can be controlled by the pressure switch (Pressostat) (7/53) normally.

In the following circumstances the compressor is disengaged to prevent it operating when full power is required, or when there is a risk of overheating:
- full acceleration; at wide open throttle (WOT) the engine control module (ECM) shuts the compressor down for a maximum of 15 seconds and a minimum of 3 seconds
- risk of overheating. If coolant temperature is above approximately 125°C the air conditioning (A/C) compressor is prevented from operating in order to reduce engine load and avoid further overheating.
- if pressure exceeds approximately 3000 kPa.
The engine control module (ECM) also prevents the compressor from engaging before the engine has started properly. The air conditioning (A/C) compressor cannot start until the engine has been started for approximately 5-15 seconds.