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Symptom Chart

WARNING: This page is about a different car, the 2003 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM CHART

Condition Possible Sources Action
  • No communication with the dual/electronic automatic temperature control module
  • Circuitry short/open
  • DATC/EATC module communication network
  • The DATC/EATC system is inoperative, intermittent or incorrect operation
  • Circuitry short/open
  • Input sensor(s)/erratic input signals
  • Automatic temperature control sensor hose and elbow
  • Incorrect/erratic direction of airflow from outlet - manual climate control
  • Function selector switch.
  • Vacuum hose.
  • A/C vacuum reservoir tank and check valve.
  • Vacuum control motor.
  • Vacuum actuator arm.
  • Mode door.
  • Incorrect/erratic direction of airflow from outlet - DATC/EATC
  • DATC/EATC module.
  • ATC solenoid and manifold assembly.
  • Vacuum hose.
  • A/C vacuum reservoir tank and check valve.
  • Vacuum control motor.
  • Vacuum actuator arm.
  • Mode door.
  • Insufficient, erratic, or no heat
  • Low engine coolant level.
  • Engine overheating.
  • Plugged or partially plugged heater core.
  • Temperature blend door is binding or stuck.
  • A/C electric blend door actuator.
  • Incorrect heater control valve operation.
  • Heater hose is kinked or binding.
  • The A/C is inoperative/does not operate correctly
  • Open fuse.
  • Circuitry short/open.
  • A/C thermostatic switch.
  • A/C system discharged/low charge.
  • A/C pressure cutoff switch.
  • A/C control.
  • Function selector switch.
  • A/C low charge protection switch.
  • The A/C is always on
  • Circuitry short.
  • A/C control.
  • A/C compressor clutch air gap
  • The temperature control is inoperative/does not operate correctly - manual climate control
  • Temperature blend door actuator control.
  • Temperature blend door.
  • A/C electronic blend door actuator motor.
  • Circuitry open/shorted.
  • The blower motor is inoperative - manual climate control
  • Fuse.
  • Circuitry open/shorted.
  • A/C blower motor switch.
  • A/C blower motor resistor.
  • Blower motor relay.
  • A/C blower motor.
  • The blower motor does not operate correctly - manual climate control
  • Circuitry short.
  • A/C blower motor resistor.
  • A/C blower motor switch.
  • The blower motor is inoperative - DATC/EATC
  • Circuitry short/open.
  • Blower motor relay.
  • A/C blower motor.
  • A/C blower motor speed control.
  • The blower motor does not operate correctly - DATC/EATC
  • A/C blower motor speed control.
  • A/C blower motor.
  • DATC/EATC module.
  • The auxiliary blower motor is inoperative
  • Fuse.
  • Circuitry short/open.
  • Auxiliary blower motor relay.
  • Auxiliary blower motor.
  • The auxiliary blower motor does not operate correctly using the front auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Auxiliary blower motor switch.
  • Auxiliary blower motor resistor.
  • The auxiliary blower motor does not operate correctly using the rear auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Auxiliary blower motor switch.
  • Auxiliary blower motor resistor.
  • The panel/floor control is inoperative using the front auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Auxiliary mode control panel.
  • Auxiliary mode door actuator.
  • Mode door.
  • The panel/floor control is inoperative using the rear auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Auxiliary mode control panel.
  • Auxiliary mode door actuator.
  • The temperature control is inoperative using the front auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Auxiliary temperature control panel.
  • Auxiliary blend door actuator.
  • Temperature blend door.
  • The temperature control is inoperative using the rear auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Auxiliary temperature control panel.
  • Auxiliary blend door actuator.
  • The panel/floor and cool/warm controls are inoperative using the front auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Auxiliary blower motor switch.
  • Auxiliary climate control panel.
  • The panel/floor and cool/warm controls are inoperative using the rear auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Auxiliary blower motor switch.
  • Auxiliary climate control panel.
  • Insufficient air conditioning (A/C) cooling
  • Restricted A/C evaporator core orifice.
  • Low refrigerant level.
  • A/C low charge protection switch.
  • Evaporator discharge air temperature sensor.
  • Temperature blend door actuator control.
  • A/C pressure cutoff switch.
  • Heater control valve.
  • Vacuum line blocked or leaking.
  • The dual temperature control is inoperative/does not operate correctly - DATC
  • Temperature blend door/actuator broken/binding
  • DATC module
  • CHECK the temperature blend doors/actuators for a binding or broken condition. If no condition is found, INSTALL a new DATC/EATC module.
  • The temperature set point does not repeat after turning the ignition switch OFF
  • Open fuse
  • Circuitry short/open
  • DATC/EATC module
  • CHECK circuit 729 (LB/BK) for a short or open and repair as necessary. If okay, INSTALL a new DATC/EATC module.
  • The temperature display will not switch between Celsius and Fahrenheit
  • DATC/EATC module
  • PRESS the MAX A/C and DEFROST buttons simultaneously for at least 0.75 seconds. If the temperature display does not switch between Celsius and Fahrenheit, INSTALL a new DATC/EATC module.
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