FixVault
Home › Lincoln › 2006 › Navigator 4WD › Repair and Diagnosis › External Pages › Different car › Section 189 (HVAC Control System - General Information) › Diagnosis And Testing › Climate Control System › Symptom Chart

Symptom Chart

WARNING: This page is about a different car, the 2005 Lincoln Navigator and 2005 Ford Expedition. 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 module
  • Circuitry short/open.
  • DATC 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(s) - 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(s) - 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 does not operate/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
  • Circuitry short/open.
  • Blower motor relay.
  • A/C blower motor.
  • A/C blower motor speed control.
  • The blower motor does not operate correctly - DATC
  • A/C blower motor speed control.
  • A/C blower motor.
  • 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.
  • 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 module.
  • CHECK circuit 729 (LB/BK) for a short or open and repair as necessary. If okay, INSTALL a new DATC module.
  • The temperature display will not switch between Celsius and Fahrenheit
  • DATC module.
  • PRESS the MAX A/C and DEFROST buttons simultaneously for at least 0.75 second. If the temperature display does not switch between Celsius and Fahrenheit, INSTALL a new DATC module.
About FixVault