Nissan Altima (L34) 2019-2024 Owners Manual: Automatic operation

Cooling and/or dehumidified heating (AUTO)

This mode may be used all year round as the system automatically works to keep a constant temperature. Air flow distribution, air intake control, and fan speed are also controlled automatically.

1. Press the AUTO button on.

2. Turn the temperature control dial to the left or right to set the desired temperature.

• Adjust the temperature display to about 75ºF (24ºC) for normal operation.
• The temperature of the passenger compartment will be maintained automatically.

  Air flow distribution, air intake control and fan speed are also controlled automatically.

• A visible mist may be seen coming from the vents in hot, humid conditions as the air is cooled rapidly. This does not indicate a malfunction.

3. You can individually set driver's and front passenger's side temperature using each temperature control dial. To synchronize the driver’s and front passenger’s temperature settings, press the SYNC button.

Heating (A/C OFF)

The air conditioner does not activate. When you need to heat only, use this mode.

1. Press the AUTO button.

2. Turn the temperature control dial to set the desired temperature.

• The temperature of the passenger compartment will be maintained automatically.

  Air flow distribution and fan speed are also controlled automatically.

• Do not set the temperature lower than the outside air temperature. Otherwise, the system may not work properly.
• Not recommended if windows fog up.

Dehumidified defrosting or defogging

1. Press the front defroster button on.

2. Turn the temperature control dial to set the desired temperature.

• To quickly remove ice from the outside of the windows, use the fan speed control buttons to set the fan speed to maximum.
• As soon as possible after the windshield is clean, press the AUTO button to return to the automatic mode.
• When the front defroster button is pressed, the air conditioner will automatically be turned on at outside temperatures above 36ºF (2ºC). The air recirculate mode automatically turns off, allowing outside air to be drawn into the passenger compartment to further improve the defogging performance.

Remote Engine Start with Intelligent Climate Control (if so equipped)

Vehicles equipped with automatic climate controls and Remote Engine Start function may go into automatic heating or cooling mode when Remote Engine Start is activated depending on outside and cabin temperatures. During this period, the climate control display and buttons will be inoperable until the ignition switch is placed in the ON position. In Remote Engine Start defrosting mode, the rear window defroster, heated seats (if so equipped) and heated steering wheel (if so equipped) may be activated automatically.