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 DIAGNOSTICS
2009 Lincoln Navigator L RWD
HVAC Climate Control System - General Information And Diagnostics
2009 Lincoln Navigator L RWDSECTION HVAC Climate Control System - General Information And Diagnostics
- Specifications
- Description And Operation
- Climate Control System
- Climate Control System
- Electronic Manual Temperature Control (EMTC) System
- Dual Automatic Temperature Control (DATC) System
- Auxiliary Climate Control System
- External Temperature Display
- System Airflow Description - Electronic Manual Temperature Control (EMTC)
- System Airflow Description - Dual Automatic Temperature Control (DATC)
- Climate Control System
- Diagnosis And Testing
- Climate Control System
- Special Tool(s)
- Principles of Operation
- Inspection and Verification
- DTC Charts
- Symptom Chart - Climate Control Systems
- Symptom Chart - NVH
- Pinpoint Tests
- Pinpoint Test A: DTC P0532 or P0533
- Pinpoint Test B: DTC P0645
- Pinpoint Test C: DTC B1251 or B1253
- Pinpoint Test D: DTC B1255 or B1257
- Pinpoint Test E: DTC B2426, B2427, B2795 or B2796
- Pinpoint Test F: DTC B2826 or B2827
- Pinpoint Test G: Unable to Duplicate the Customer Concern and No DTCs Present
- Pinpoint Test H: The Air Inlet Door is Inoperative
- Pinpoint Test I: Incorrect/Erratic Direction of Airflow From Outlets
- Pinpoint Test J: Insufficient, Erratic or No Heat
- Pinpoint Test K: The Air Conditioning (A/C) is Inoperative
- Pinpoint Test L: The Air Conditioning (A/C) is Always On - A/C Compressor Does Not Cycle
- Pinpoint Test M: The Air Conditioning (A/C) is Always On - A/C Mode Always Commanded ON
- Pinpoint Test N: Temperature Control is Inoperative/Does Not Operate Correctly - EMTC Systems
- Pinpoint Test O: Temperature Control is Inoperative/Does Not Operate Correctly - DATC Systems
- Pinpoint Test P: The Blower Motor is Inoperative - EMTC
- Pinpoint Test Q: The Blower Motor Does Not Operate Correctly - EMTC
- Pinpoint Test R: The Blower Motor is Inoperative - DATC
- Pinpoint Test S: The Blower Motor Does Not Operate Correctly - DATC
- Pinpoint Test T: The Auxiliary Blower Motor is Inoperative
- Pinpoint Test U: The Auxiliary Blower Motor Does Not Operate Correctly
- Pinpoint Test V: The Auxiliary Temperature Control is Inoperative/Does Not Operate Correctly Using the Front/Rear Auxiliary Climate Controls
- Pinpoint Test W: The Auxiliary Panel/Floor Control is Inoperative/Does Not Operate Correctly Using the Front/Rear Auxiliary Climate Controls
- Pinpoint Test X: The Auxiliary Temperature, Panel/Floor and Blower Motor Controls are Inoperative/Do Not Operate Correctly Using the Rear Auxiliary Climate Controls
- Pinpoint Test Y: DTC B1676
- Component Tests
- Resistor - Blower Motor
- Resistor - Auxiliary Blower Motor (Expedition/Navigator)
- Resistor - Auxiliary Blower Motor (Expedition EL/Navigator L)
- Temperature Sensor - In-Vehicle, Expedition
- Temperature Sensor - In-Vehicle, Navigator
- Temperature Sensor - Ambient
- Temperature Sensor - Evaporator
- Air Inlet Door Actuator
- Defrost/Panel/Floor Door Actuator
- Temperature Blend Door Actuator
- Auxiliary Temperature Door Actuator - Expedition/Navigator
- Auxiliary Temperature Door Actuator - Expedition EL/Navigator L
- Auxiliary Panel/Floor Door Actuator - Expedition/Navigator
- Auxiliary Panel/Floor Door Actuator - Expedition EL/Navigator L
- Rear Auxiliary Climate Control Assembly
- Heater Core
- Heater Core - Plugged
- Heater Core - Pressure Test
- Heater Core - Bench Test
- Evaporator/Condenser Core - On-Vehicle Leak Test
- A/C Compressor - External Leak Test
- Climate Control System
- General Procedures
- Refrigerant System Tests
- Spring Lock Coupling
- Heater Hose Coupling
- Air Conditioning (A/C) Clutch Air Gap Adjustment
- Electronic Leak Detection
- Fluorescent Dye Leak Detection
- Air Conditioning (A/C) System Flushing
- Air Conditioning (A/C) System Recovery, Evacuation and Charging
- Special Tool(s)
- Material
- Refrigerant System Recovery
- Refrigerant System Evacuation Using a R-134a Refrigerant Management Machine
- Refrigerant System Evacuation Using a R-134a Manifold Gauge Set and Vacuum Pump
- Refrigerant System Charging Using a R-134a Refrigerant Management Machine
- Refrigerant System Charging Using a R-134a Manifold Gauge Set and Automatic Refrigerant Charging Meter
- Refrigerant System Filtering Following Air Conditioning (A/C) Compressor Installation
- Refrigerant Oil Adding
- Refrigerant Identification Testing
- Air Conditioning (A/C) Odor Treatment
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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.