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Symptom Chart: Notes

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM CHART

Condition Possible Sources Action
  • The steering wheel control switch is inoperative/does not operate correctly
  • Circuitry short/open.
  • Steering wheel control switch.
  • DATC module.
  • No communication with the dual electronic automatic temperature control (DATC) module
  • Circuitry short/open.
  • DATC module communication network.
  • The DATC system is inoperative, intermittent or incorrect operation
  • Circuitry short/open.
  • Input sensor(s)/erratic input signals.
  • Automatic temperature control aspirator hose and elbow.
  • Incorrect/erratic direction of airflow from outlets - 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 outlets - DATC
  • DATC 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 system discharged/low charge.
  • A/C pressure cutoff switch.
  • A/C control.
  • Function selector switch.
  • A/C cycling switch.
  • A/C compressor clutch air gap.
  • A/C clutch relay.
  • The A/C is always on
  • Circuitry short.
  • A/C control.
  • A/C compressor clutch air gap.
  • A/C clutch relay.
  • 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.
  • 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.
  • Blower motor high speed relay.
  • The blower motor is inoperative - DATC
  • Circuitry short/open.
  • Blower motor relay.
  • A/C blower motor.
  • A/C blower motor speed control.
  • The blower motor does not operate correctly - DATC
  • Circuitry short/open.
  • A/C blower motor speed control.
  • DATC 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.
  • Front auxiliary control panel.
  • Auxiliary mode door actuator.
  • Mode door.
  • The panel/floor control is inoperative using the rear auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Rear auxiliary control panel.
  • Front auxiliary control panel.
  • The temperature control is inoperative using the front auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Front auxiliary control panel.
  • Auxiliary blend door actuator.
  • Temperature blend door.
  • The temperature control is inoperative using the rear auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Rear auxiliary control panel.
  • Front auxiliary control panel.
  • The panel/floor and cool/warm controls are inoperative using the front auxiliary climate controls
  • Fuse.
  • Circuitry short/open.
  • Auxiliary blower motor switch.
  • Front auxiliary 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.
  • Rear auxiliary control panel.
  • Front auxiliary control panel.
  • Insufficient air conditioning (A/C) cooling
  • Low refrigerant level.
  • A/C cycling switch.
  • 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
  • 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, GO to PINPOINT TEST A . If the LH temperature control is not correct diagnose for DTC B2266. If the RH temperature control is not correct diagnose for DTC B2267.
  • The temperature set point does not repeat after turning the ignition switch OFF
  • Open fuse.
  • Circuitry short/open.
  • DATC module.
  • The temperature display will not switch between Celsius and Fahrenheit
  • DATC module.
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