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Symptom Chart

WARNING: This page is about a different car, the 2005 Lincoln Town Car. 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 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 sensor hose and elbow.
  • 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.
  • Insufficient, erratic, or no heat
  • Low engine coolant level.
  • Engine overheating.
  • Plugged or partially plugged heater core.
  • Temperature blend door binding or stuck.
  • A/C electric blend door actuator.
  • Blend door circuit open/shorted.
  • The air conditioning (A/C) is inoperative/does not operate correctly
  • Open fuse.
  • A/C clutch relay.
  • Circuitry short or open.
  • A/C low charge protection switch.
  • A/C system discharged or low charge.
  • A/C compressor clutch.
  • A/C evaporator discharge air temperature sensor.
  • A/C pressure sensor.
  • DATC module
  • PCM
  • The air conditioning (A/C) is always on
  • Circuitry short or open.
  • DATC module.
  • A/C clutch relay.
  • A/C compressor clutch.
  • A/C evaporator core temperature sensor.
  • The blower motor is inoperative
  • Circuitry open or shorted.
  • Blower motor.
  • Blower motor speed control.
  • Blower motor relay.
  • The blower motor does not operate correctly
  • Blower motor speed control.
  • DATC module.
  • Circuit short or open.
  • The rear audio/climate control switch is inoperative/does not operate correctly - early build
  • Circuitry short or open.
  • Rear audio/climate control switch.
  • Rear audio/climate control module.
  • Audio control module (ACM).
  • DATC module.
  • The temperature set point does not repeat after turning the ignition switch off
  • Open fuse.
  • Circuitry short or open.
  • DATC module.
  • CHECK circuit 729 (RD/WH) for a short or open and REPAIR as necessary. If okay, INSTALL a new DATC module.
  • 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 module.
  • The temperature display will not switch between Celsius and Fahrenheit
  • DATC module.
  • INSTALL a new DATC/EATC module.
  • Inaccurate external temperature display
  • EATC module
  • REFER to DESCRIPTION AND OPERATION  of the EATC External Temperature Display. If the external temperature display is not operating as described and no DTC is present, CARRY OUT the ambient temperature sensor component test in this section. If the sensor tests OK, INSTALL a new EATC module. REFER to AIR DISTRIBUTION AND FILTERING . TEST the system for normal operation.
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