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Symptom Chart

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. 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 electronic automatic temperature control module
  • Circuitry short/open.
  • EATC module communication network.
  • The EATC system is inoperative, intermittent or incorrect operation
  • Circuitry short/open.
  • Input sensor(s)/erratic input signals.
  • Charging system.
  • Automatic temperature control sensor hose and elbow.
  • Incorrect/erratic direction of air flow from outlet - manual climate control
  • Function selector switch.
  • Vacuum hose.
  • A/C vacuum reservoir tank and check valve.
  • Vacuum control motor.
  • Vacuum actuator arm.
  • Incorrect/erratic direction of air flow from outlet - EATC
  • EATC module.
  • ATC solenoid and manifold assembly.
  • Vacuum hose.
  • A/C vacuum reservoir tank and check valve.
  • Vacuum control motor.
  • Vacuum actuator arm.
  • Insufficient, erratic, or no heat
  • Low engine coolant level.
  • Engine overheating.
  • Plugged or partially plugged heater core.
  • Temperature blend door binding/stuck.
  • A/C electric blend door actuator.
  • Incorrect heater control valve operation.
  • The A/C does not operate/does not operate correctly
  • Open fuse.
  • Circuitry short/open.
  • A/C cycling switch.
  • A/C system discharged/low charge.
  • A/C pressure cutoff switch.
  • A/C control.
  • Function selector switch.
  • The A/C is always on
  • Circuitry short.
  • A/C control.
  • A/C compressor clutch air gap.
  • 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 is inoperative - EATC
  • Circuitry short/open.
  • Blower motor relay.
  • A/C blower motor.
  • A/C blower motor speed control.
  • EATC module.
  • The blower motor operates continuously in high speed - manual climate control
  • Circuitry short.
  • A/C blower motor switch.
  • Blower motor relay.
  • No operation in high blower setting - manual climate control
  • A/C blower motor switch.
  • Circuitry short/open.
  • No operation in lower speeds - manual climate control
  • Circuitry short/open.
  • A/C blower motor resistor.
  • A/C blower motor switch.
  • The blower motor does not operate correctly - EATC
  • Circuitry short/open.
  • A/C blower motor speed control.
  • A/C blower motor.
  • EATC module.
  • The temperature set point does not repeat after turning the ignition switch OFF - EATC
  • Open fuse.
  • Circuitry short/open.
  • EATC module.
  • CHECK circuit 22 (LB/BK) for a short or open and repair as necessary. If okay, INSTALL a new EATC module.
  • The temperature display will not switch between Celsius and Fahrenheit - EATC
  • EATC module
  • PRESS the AUTO and DEFROST/FLOOR buttons simultaneously for at least 0.75 second. If the temperature display does not switch between Celsius and Fahrenheit, INSTALL a new EATC module.
  • The steering wheel control switch is inoperative/does not operate correctly
  • Circuitry short/open.
  • Steering wheel control switch.
  • EATC module.
  • Insufficient A/C cooling
  • Low refrigerant level.
  • Temperature blend door actuator.
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