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 MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 993 (CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS)
2009 Mercury Milan Premier, 3.0 1, AWD
Section 993 (Climate Control System - General Information And Diagnostics)
2009 Mercury Milan Premier, 3.0 1, AWDSECTION Section 993 (Climate Control System - General Information And Diagnostics)
WARNING: This page is about a different car, the 2008 Mercury Milan, 2008 Lincoln MKZ, and 2008 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Description And Operation
- Diagnostic Tests
- Climate Control System
- Notes
- Principles of Operation
- Compressor Anti-Slugging Strategy (CASS)
- The Refrigerant Cycle
- Inspection and Verification
- Alternate Diagnostic Methods - HVAC Module - Electronic Automatic Temperature Control (EATC) and HVAC Module - Dual Automatic Temperature Control (DATC)
- Notes
- HVAC Module - Electronic Automatic Temperature Control (EATC) and HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test
- HVAC Module - Electronic Automatic Temperature Control (EATC) and HVAC Module - Dual Automatic Temperature Control (DATC) - Retrieve Continuous DTCs
- HVAC Module Cold Boot Process
- PCM DTC Chart
- HVAC Module - Electronic Automatic Temperature Control (EATC) and HVAC Module - Dual Automatic Temperature Control (DATC) DTC Chart
- Symptom Chart - Climate Control System
- Symptom Chart - NVH
- Pinpoint Tests
- Pinpoint Test A: DTC P0532 or P0533
- Pinpoint Test B: DTC P0537 or P0538
- Pinpoint Test C: DTC P0645
- Pinpoint Test D: DTC B1251 or B1253
- Pinpoint Test E: DTC B1255 or B1257
- Pinpoint Test F: DTC B2426, B2427, B2795 or B2796
- Pinpoint Test G: DTC B2826 or B2827
- Pinpoint Test H: Air Inlet Door is Inoperative
- Pinpoint Test I: Incorrect/Erratic Direction of Airflow From Outlet(s)
- Pinpoint Test J: DTC: B1676 - Battery Voltage Out of Range
- Pinpoint Test K: HVAC Functions Verification
- Pinpoint Test L: Insufficient, Erratic or No Heat
- Pinpoint Test M: The Air Conditioning (A/C) is Inoperative
- Pinpoint Test N: The Air Conditioning (A/C) is Always On - A/C Compressor Does Not Cycle
- Pinpoint Test O: The Air Conditioning (A/C) is Always On - A/C Mode Always Commanded ON
- Pinpoint Test P: Temperature Control is Inoperative/Does Not Operate Correctly - EMTC
- Pinpoint Test Q: Temperature Control is Inoperative/Does Not Operate Correctly - EATC/DATC
- Pinpoint Test R: The Blower Motor is Inoperative - EMTC
- Pinpoint Test S: The Blower Motor Does Not Operate Correctly - EMTC
- Pinpoint Test T: The Blower Motor is Inoperative - DATC/EATC
- Pinpoint Test U: The Blower Motor Does Not Operate Correctly - DATC/EATC
- Component Tests
- Climate Control System
- General Procedures
- Refrigerant System Tests
- Air Conditioning (A/C) Clutch Air Gap Adjustment
- Fluorescent Dye Leak Detection
- Electronic Leak Detection
- Air Conditioning (A/C) System Recovery, Evacuation and Charging
- Notes
- Refrigerant System Recovery
- Refrigerant System Evacuation Using an R-134a Refrigerant Management Machine
- Refrigerant System Evacuation Using an R-134a Manifold Gauge Set
- Refrigerant System Charging Using an R-134a Refrigerant Management Machine
- Refrigerant System Charging Using an R-134a Manifold Gauge Set and Automatic Refrigerant Charging Motor
- Air Conditioning (A/C) System Flushing
- 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.