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.
2003 Ford ZX2 AutomaticFACTORY OEM SERVICE PROCEDURE
Section 345 (Climate Control System)
WARNING: This page is about a different car, the 2003 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
- Component Location
- Specifications
- Description And Operation
- Diagnosis And Testing
- Climate Control System
- Notes
- Special Tool(s)
- Inspection and Verification
- Notes
- Dual Electronic Automatic Temperature Control (DATC) Module Diagnostic Trouble Codes - DTCs
- Front Panel DATC Module Self-Test (On-Demand Diagnostic Trouble Codes-DTCs)
- Front Panel DATC Module Display-Retrieve Continuous Diagnostic Trouble Codes (DTCs)
- Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) Index
- Dual Electronic Automatic Temperature Control (DATC) Module Diagnostic Trouble Code (DTC) Index
- Symptom Chart
- Notes
- Connector Circuit Reference
- DATC Module C228a
- DATC Module C228b
- In-Vehicle Temperature Sensor C233
- Discharge Temperature Sensor (LH) C235
- Discharge Temperature Sensor (RH) C255
- Evaporator Discharge Air Temperature Sensor C296
- Ambient Air Temperature Sensor C132
- Blower Motor Speed Control Module C297
- Cool Air Bypass Door Actuator C295
- Air Inlet Door Actuator C289
- Floor Mode Door Actuator C234
- Panel Mode Door Actuator C236
- Defrost Mode Door Actuator C232
- Solar Radiation Sensor C286
- A/C Compressor Clutch Field Coil C100
- Powertrain Control Module (PCM) C175a
- Blower Motor C288
- Auxiliary Coolant Pump Motor C163
- Coolant Control Valve Solenoid C1034
- Blower Motor Relay
- A/C Compressor Clutch Relay
- Auxiliary Coolant Pump Relay
- Pinpoint Test A: No Communication With The Dual Automatic Temperature Control (DATC) Module
- Pinpoint Test B: The DATC System Is Inoperative, Intermittent or Incorrect Operation
- Pinpoint Test C: Incorrect/Erratic Direction Of Airflow From Outlets
- Pinpoint Test D: DTC B1251 OR DTC 1253 - A/C In-Vehicle Temperature Sensor Open Circuit or Short to Ground
- Pinpoint Test E: Evaporator Or Heater Core Discharge Air Temperature Sensor Circuit Open Or Short To Ground
- Pinpoint Test F: DTC B1255 OR DTC B1257-A/C Ambient Temperature Sensor Open Circuit or Short to Ground
- Pinpoint Test G: DTC B1259 OR DTC B1261 - Solar Radiation Sensor Open Circuit or Short to Ground
- Pinpoint Test H: Insufficient, Erratic or No Heat
- Pinpoint Test I: Insufficient Heat During Engine Idle-3.9 L Engine
- Pinpoint Test J: Full Heat Only In All Modes
- Pinpoint Test K: The Dual Temperature Control Is Inoperative/Does Not Operate Correctly
- Pinpoint Test L: The A/C Does Not Operate/Does Not Operate Correctly
- Pinpoint Test M: The Air Conditioning (A/C) Is Always On
- Pinpoint Test N: the Blower Motor Is Inoperative
- Pinpoint Test O: The Blower Motor Does not Operate Correctly
- Component Tests
- Climate Control System
- General Procedures
- Air Conditioning (A/C) System Check - Retail Procedure
- Spring Lock Coupling
- Air Conditioning Line (Peanut) Fitting
- Heater Hose Coupling
- A/C Clutch Air Gap Adjustment
- Manifold Gauge Set Connection
- 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 After A/C Component Replacement
- Refrigerant Oil Adding
- Refrigerant Identification Testing
- Removal And Installation
- Instrument Panel Registers
- Air Distribution Ducts
- Plenum Chamber, Assembly and Components
- Heater Control Valve and Heater Hoses
- Blower Motor
- Heater Core and Evaporator Core Housing, Assembly and Components
- Air Conditioning (A/C) Compressor - 3.0L (4V)
- Air Conditioning (A/C) Compressor - 3.9L
- Receiver Drier
- Condenser Core
- Receiver Drier Manifold and Tube Assembly
- Compressor Manifold and Tube Assembly - 3.0L (4V)
- Compressor Manifold and Tube Assembly - 3.9L
- Thermostatic Expansion Valve Manifold and Tube Assembly - 3.0L (4V)
- Thermostatic Expansion Valve Manifold and Tube Assembly - 3.9L
- Thermostatic Expansion Valve
- Climate Control Assembly
- In-Vehicle Temperature Sensor
- Mode Door Actuator - Air Inlet Door
- Mode Door Actuator - Floor Door
- Mode Door Actuator - Cold Air Bypass Door
- Mode Door Actuator - Defrost Door
- Mode Door Actuator - Panel Door
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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