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 274 (HVAC CONTROL SYSTEM - GENERAL INFORMATION & DIAGNOSTICS)
2009 Mercury Milan Premier, 3.0 1, AWD
Section 274 (HVAC Control System - General Information & Diagnostics)
2009 Mercury Milan Premier, 3.0 1, AWDSECTION Section 274 (HVAC Control System - General Information & Diagnostics)
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Description And Operation
- Diagnosis And Testing
- Climate Control System
- Special Tool(s)
- Vacuum Schematic - Manual A/C
- Vacuum Schematic - Electronic Automatic Temperature Control
- Inspection and Verification
- Electronic Automatic Temperature Control Module Self-Test
- Electronic Automatic Temperature Control (EATC) Module Cold Boot Process
- Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index
- Symptom Chart
- Pinpoint Tests
- Pinpoint Test A: DTC B1249 - Blend Door Failure Or Short
- Pinpoint Test B: DTC B1251 Or DTC B1253 - A/C In-Vehicle Temperature Sensor Open Circuit Or Short To Ground
- Pinpoint Test C: DTC B1255 Or DTC B1257 - A/C Ambient Temperature Sensor Open Circuit Or Short To Ground
- Pinpoint Test D: DTC B1261 - Solar Radiation Sensor Circuit Short To Ground
- Pinpoint Test E: No Communication With The Electronic Automatic Temperature Control Module
- Pinpoint Test F: The EATC System Is Inoperative, Intermittent Or Incorrect Operation
- Pinpoint Test G: Incorrect/Erratic Direction Of Air Flow From Outlets - Manual Climate Control
- Pinpoint Test H: Incorrect/Erratic Direction Of Air Flow From Outlets - EATC
- Pinpoint Test I: Insufficient, Erratic Or No Heat
- Pinpoint Test J: The Air Conditioning (A/C) Is Inoperative/Does Not Operate Correctly
- Pinpoint Test K: The Air Conditioning (A/C) Is Always On
- Pinpoint Test L: Temperature Control Is inoperative/Does Not Operate Correctly - Manual Climate Control
- Pinpoint Test M: The Blower Motor Is inoperative - Manual Climate Control
- Pinpoint Test N: The Blower Motor Is inoperative - EATC
- Pinpoint Test O: The Blower Motor Does Not Operate Correctly - Manual Climate Control
- Pinpoint Test P: The Blower Motor Does Not operate Correctly - EATC
- Pinpoint Test Q: The Steering Wheel Control Switch Is Inoperative/Does Not Operate Correctly
- Component Tests
- Climate Control System
- General Procedures
- Spring Lock Coupling
- Refrigerant System Tests
- Air Conditioning (A/C) Clutch Air Gap Adjustment
- Electronic Leak Detection
- Fluorescent Dye Leak Detection
- Air Conditioning (A/C) System Recovery, Evacuation and Charging
- Air Conditioning (A/C) System Flushing
- Refrigerant System Filtering Following Air Conditioning (A/C) Compressor Installation
- Refrigerant Oil Adding
- Refrigerant Identification Testing
- Vacuum Hose Repair - Mini-Tube
- 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.