Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLINCOLN2009NAVIGATOR L RWDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICSDESCRIPTION AND OPERATIONCLIMATE CONTROL SYSTEMSYSTEM AIRFLOW DESCRIPTION - DUAL AUTOMATIC TEMPERATURE CONTROL (DATC)AUTO
2009 Lincoln Navigator L RWD
System Airflow Description - Dual Automatic Temperature Control (DATC): Auto
2009 Lincoln Navigator L RWDSECTION Auto
When AUTO is selected:
- the temperature control setting is manually set to the desired setting.
- the air inlet door actuator is automatically controlled by the HVAC module - DATC , based on the temperature setting.
- the mode door actuators are automatically controlled by the HVAC module - DATC based on the temperature setting.
- the A/C request is automatically controlled by the HVAC module - DATC based on the temperature settings. The A/C compressor will not operate if the outside air temperature is below 6°C (43°F). The A/C indicator automatically turns ON when the outside air temperature rises above 14°C (58°F) and automatically turns OFF when the outside air temperature falls below 11°C (51°F).
- The A/C request button and the RECIRC request button can be manually selected. When manually selected, the A/C indicator will not change state with changing outside air temperature.
- the blower motor is ON. The blower motor speed is automatically controlled by the HVAC module - DATC based on the temperature setting, but can be manually overridden.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.