HVAC Control System - General Information

• Specifications
  • General Specifications
  • Torque Specifications
• Description & 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
      • Max A/C
      • Norm A/C
      • Vent
      • Off
      • Floor
      • Mix
      • Defrost
    • System Airflow Description - EATC
      • Max A/C
      • Norm A/C
      • Vent
      • Off
      • Floor
      • Floor/Defrost
      • Defrost
    • Manual A/C Electrical Components
    • EATC System Electrical Components
• Diagnosis & 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 & 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
      • 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: The 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 & Manual Climate Control
      • 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: Insufficient Air Conditioning (A/C) Cooling
      • Pinpoint Test M: No Operation In All Temperature Settings - Manual Climate Control
      • Pinpoint Test N: The Blower Motor Is Inoperative - Manual Climate Control
      • Pinpoint Test O: The Blower Motor Is Inoperative - EATC
      • Pinpoint Test P: No Operation In High Blower Setting - Manual Climate Control
      • Pinpoint Test Q: The Blower Motor Does No Operate Correctly - Manual Climate Control
      • Pinpoint Test R: The Blower Motor Operates Continuously In High Speed - Manual Climate Control
      • Pinpoint Test S: The Blower Motor Does Not Operate Correctly - EATC
      • Pinpoint Test T: The 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
      • Evaporator/Condenser Core - On-Vehicle Leak Test
      • A/C Compressor - External Leak Test
• General Procedures
  • Air Conditioning (A/C) System Check - Retail Procedure
  • Spring Lock Coupling
    • Notes
    • Disconnect
    • Cleaning
    • Connect
  • Air Conditioning Line (Peanut) Fitting
    • Disconnect
    • Connect
  • Refrigerant System Tests
  • Air Conditioning (A/C) Clutch Air Gap Adjustment
  • Manifold Gauge Set Connection
  • Electronic Leak Detection
  • Fluorescent Dye Leak Detection
    • Notes
    • Fluorescent Dye Detection
    • Fluorescent Dye Injection - Using An A/C Refrigerant Center & Dye Injector
    • Fluorescent Dye Injection - Using A Dye Injector Loop Kit
  • Air Conditioning (A/C) System Flushing
  • Air Conditioning (A/C) System Recovery, Evacuation & Charging
    • Notes
    • Refrigerant System Recovery
    • Refrigerant System Evacuation
    • Refrigerant System Charging
  • Refrigerant System Filtering Following Air Conditioning (A/C) Component Installation
    • Special Tool(s)
  • Refrigerant Oil Adding
  • Refrigerant Identification Testing
  • Contaminated Refrigerant Handling
  • Vacuum Hose Repair - Mini-Tube