Maximum A/C (Automatic System Only)

Maximum A/C (Automatic System Only)

Pressing the maximum A/C (air conditioning) switch while the engine is running and the ambient temperature is more than 7 degrees C (45 degrees F) provides the maximum cooling possible from the system to cool the passenger compartment down as rapidly as possible. When maximum A/C (air conditioning) is selected the coolant valves are held closed, the A/C (air conditioning) compressor is engaged, the blower speed is set to maximum and the recirculation doors are set to the recirculation position. After 12 minutes the recirculation doors will be set to fresh air for 1 minute then returned to the recirculation position.

The maximum A/C (air conditioning) function is cancelled when any of the other A/C (air conditioning) system switches are pressed.

Rest Heating (Automatic System Only)
When the engine is not running, pressing the maximum A/C (air conditioning) switch activates the rest heating function to heat the passenger compartment with residual heat from the engine. The rest heating function activates provided the following conditions exist:
^ It is less than 15 minutes since the ignition was selected off.
^ Ambient temperature is less than 15 degrees C (59 degrees F).
^ On the previous ignition cycle engine temperature exceeded 70 degrees C (158 degrees F).
^ Battery voltage is 11.4 V minimum.

To provide the rest heating function, the ATC (automatic temperature control) module activates the auxiliary coolant pump, coolant valves, control door and blower. The ATC (automatic temperature control) module regulates the temperature (to the driver setting selected before the ignition was switched off), opens the face level distribution doors and runs the blower at speed 4.

The rest heating function is cancelled after 15 minutes or when:
^ The maximum A/C (air conditioning) switch is pressed again.
^ The ignition is selected on.
^ Battery voltage decreases to less than 11 V.