Nissan Altima (L34) 2019-2025 Owners Manual: Air conditioner operation

Start the engine, turn thefan speed control dial to the desired position, and press thebutton to activate the air conditioner. When the air conditioner is on, cooling and dehumidifying functions are added to the heater operation.

The air conditioner cooling function operates only when the engine is running.

Cooling

This mode is used to cool and dehumidify the air.

1. Press thebutton to the off position.

2. Press theair flow control button.

3. Turn thefan speed control dial to the desired position.

4. Press the A/C button. The indicator light comes on.

5. Turn the temperature control dial to the desired position.

• For quick cooling when the outside temperature is high, press thebutton to the ON position. Be sure to return the to the off position for normal cooling.

  MAX A/C may be used for quick cooling.

Dehumidified heating

This mode is used to heat and dehumidify the air.

1. Press the button to the off position.

2. Press the air flow control button.

3. Turn the fan speed control dial to the desired position.

4. Press the A/C (air conditioner) button.

The indicator light comes on.

5. Turn the temperature control dial to the desired position.

Dehumidified defogging

This mode is used to defog the windows and dehumidify the air.

1. Press theair flow control button.

2. Turn the fan speed control dial to the desired position.

• When theorare selected, the air conditioner automatically turns on if the outside temperature is more than 36ºF (2ºC). This dehumidifies the air which helps defog the windshield. The mode automatically turns off, allowing outside air to be drawn into the passenger compartment to further improve the defogging performance.

3. Turn the temperature control dial to the desired position.

Operating tips

• Keep the windows closed while the air conditioner is in operation.
• After parking in the sun, drive for 2 or 3 minutes with the windows open to vent hot air from the passenger compartment.

  Then, close the windows. This allows the air conditioner to cool the interior more quickly.

• The air conditioning system should be operated for approximately 10 minutes at least once a month. This helps prevent damage to the system due to lack of lubrication.
• A visible mist may be seen coming from the ventilators in hot, humid conditions as the air is cooled rapidly. This does not indicate a malfunction.
• If the engine coolant temperature gauge indicates engine coolant temperature over the normal range, turn the air conditioner off. For additional information, see "If your vehicle overheats".
• When Remote Engine Start (if so equipped) is activated, the manual climate control system will default to the last used heating or cooling mode.

Air flow charts

The following charts show the button and dial positions for MAXIMUM AND QUICK heating, cooling or defrosting. Theair recirculation button should always be in the off position for heating and defrosting.