Rest Heating (Automatic System Only)

When the engine is not running, pressing the maximum air conditioning (A/C) 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°C (59°F).
• On the previous ignition cycle engine temperature exceeded 70°C (158°F).
• Battery voltage is 11.4 V minimum.

To provide the rest heating function, the ATC module activates the auxiliary coolant pump, coolant valves, control door and blower. The ATC 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 air conditioning (A/C) switch is pressed again.
• The ignition is selected on.
• Battery voltage decreases to less than 11 V.