Section 256 (HVAC Control System - General Information)
WARNING: This page is about a different car, the 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Description And Operation
- Climate Control System
- Notes
- Principles of Operation
- Heat Transfer
- Latent Heat of Vaporization
- Relative Humidity
- Effects of Pressure on Boiling or Condensation
- Compressor Anti-Slugging Strategy
- The Refrigerant Cycle
- Clutch Cycling Orifice Tube Type Refrigerant System
- System Air Flow Description - Manual Climate Control
- System Airflow Description - EATC
- Climate Control System
- Diagnosis And Testing
- Climate Control System
- Notes
- Special Tool(s)
- Vacuum Schematic - Manual A/C
- Vacuum Connector End View - Manual A/C
- Vacuum Application Chart - Manual A/C
- Vacuum Schematic - Electronic Automatic Temperature Control
- Vacuum Connector End View - Electronic Automatic Temperature Control
- Vacuum Applications Chart - Electronic Automatic Temperature Control
- Inspection and Verification
- Electronic Automatic Temperature Control Module Self-Test
- Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) Index
- Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index
- Symptom Chart
- Pinpoint Test A: DTC B1249 - Blend Door Failure Or Short
- Pinpoint Test B: DTC B1251 Or DTC B1253 - A/C In-Car 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 - A/C Solar Radiation Sensor Circuit Short To Ground
- Pinpoint Test E: No Communication With The Electronic Automatic Temperature Control (EATC) Module
- Pinpoint Test F: EATC System Is Inoperative, Intermittent Or Incorrect Operation
- Pinpoint Test G: Incorrect/Erratic Direction Of Air Flow From Outlet - Manual Climate Control
- Pinpoint Test H: Incorrect/Erratic Direction Of Air Flow From Outlet - EATC
- Pinpoint Test I: Insufficient, Erratic, Or No Heat - EATC And Manual Climate Control
- Pinpoint Test J: Air Conditioning (A/C) Is Inoperative/Does Not Operate Correctly
- Pinpoint Test K: Air Conditioning (A/C) Is Always On
- Pinpoint Test L: Temperature Control Is Inoperative/Does Not Operate Correctly - Manual Climate Control
- Pinpoint Test M: Blower Motor Is Inoperative - Manual Climate Control
- Pinpoint Test N: Blower Motor Is Inoperative - EATC
- Pinpoint Test O: Blower Motor Does Not Operate Correctly - Manual Climate Control
- Pinpoint Test P: Blower Motor Does Not Operate Correctly - EATC
- Pinpoint Test Q: Steering Wheel Control Switch Is Inoperative/Does Not Operate Correctly
- Component Tests
- Heater Core
- Heater Core - Plugged
- Heater Core - Pressure Test
- Heater Core - Bench Test
- A/C Evaporator/Condenser Core - On Vehicle Leak Test
- A/C Compressor - External Leak Test
- Climate Control System
- General Procedures
- Air Conditioning (A/C) System Check - Retail Procedure
- Spring Lock Coupling
- Refrigerant System Tests
- Air Conditioning Line (Peanut) Fitting
- A/C Clutch Air Gap Adjustment
- Manifold Gauge Set Connection
- Electronic Leak Detection
- Fluorescent Dye Leak Detection
- Air Conditioning (A/C) System Flushing
- Air Conditioning (A/C) System Recovery, Evacuation and Charging
- Refrigerant System Filtering Following Air Conditioning (A/C) Component Installation
- Refrigerant Oil Adding
- Inspection and Assembly Requirements - Following an A/C Compressor Failure
- Refrigerant Identification Testing
- Contaminated Refrigerant Handling
- Vacuum Hose Repair - Mini-Tube