- No communication with the electronic automatic temperature control (EATC) module
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- Circuitry open.
- EATC module communication network.
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- The EATC system is inoperative, intermittent or incorrect operation
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- Circuitry open.
- Input sensor(s)/erratic input signals.
- Automatic temperature control aspirator hose and elbow.
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- Incorrect/erratic direction of airflow from outlets
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- Circuitry short/open.
- Door actuator.
- Mode door binding or stuck.
- EMTC module or EATC module.
- Door actuator arm not connected to the door crank.
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- Insufficient, erratic or no heat
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- Low engine coolant level.
- Engine overheating.
- Plugged or partially plugged heater core.
- Temperature blend door is binding or stuck.
- Temperature blend door actuator.
- Heater hose is kinked or binding.
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- The A/C is inoperative/does not operate correctly
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- Open fuse.
- Circuitry short/open.
- A/C system discharged/low charge.
- PCM.
- EATC module.
- EMTC module.
- A/C compressor clutch air gap.
- A/C clutch relay.
- Instrument cluster
- Instrument cluster configuration
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- Circuitry short/open.
- EATC module.
- EMTC module.
- PCM.
- A/C compressor clutch air gap.
- A/C clutch relay.
- Instrument cluster
- Instrument cluster configuration
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- The temperature control is inoperative/does not operate correctly
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- Circuitry open/shorted.
- EMTC module.
- EATC module.
- Temperature blend door.
- Temperature blend door actuator.
- Door actuator arm not connected to the door crank.
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- The blower motor is inoperative - EMTC
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- Fuse.
- Circuitry open/shorted.
- A/C blower motor switch.
- Blower motor relay.
- A/C blower motor.
- EMTC module.
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- The blower motor does not operate correctly - EMTC
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- Circuitry shorted.
- A/C blower motor resistor.
- A/C blower motor switch.
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- The blower motor is inoperative - EATC
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- Circuitry short/open.
- Blower motor relay.
- A/C blower motor.
- EATC module.
- A/C blower motor speed control.
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- The blower motor does not operate correctly - EATC
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- Circuitry short/open.
- A/C blower motor speed control.
- EATC module.
- A/C blower motor speed control.
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- The auxiliary blower motor is inoperative
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- Fuse.
- Circuitry short/open.
- Auxiliary blower motor resistor.
- Auxiliary blower motor.
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- The auxiliary blower motor does not operate correctly
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- Fuse.
- Circuitry short/open.
- Auxiliary blower motor relay 1.
- Auxiliary blower motor relay 2.
- Auxiliary blower motor relay 3.
- Rear auxiliary control.
- Auxiliary blower motor resistor.
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- The auxiliary temperature control only is inoperative/does not operate correctly
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- Fuse.
- Circuitry short/open.
- Auxiliary blend door actuator.
- Auxiliary blend door.
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- The auxiliary panel/floor control only is inoperative/does not operate correctly
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- Fuse.
- Circuitry short/open.
- Auxiliary mode door actuator.
- Auxiliary mode door.
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- The auxiliary temperature/panel/floor and blower motor control is inoperative/does not operate correctly
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- Fuse.
- Circuitry short/open.
- Rear auxiliary control.
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- The dual temperature control is inoperative/does not operate correctly
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- Temperature blend door/actuator broken/binding.
- EATC module.
- Low A/C refrigerant charge.
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- CHECK that the A/C system pressure is above 290 kPa (42 psi). If the pressure is below 290 kPa (42 psi), REFER to FLUORESCENT DYE LEAK DETECTION . CHECK the temperature blend doors/actuators for a binding or broken condition. If no condition is found, INSTALL a new EMTC/EATC module.
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- The temperature set point does not repeat after turning the ignition switch OFF
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- Open fuse.
- Circuitry short/open.
- EATC module.
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- CHECK circuit 483 (RD) for a short or open and repair as necessary. If okay, INSTALL a new EATC module.
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- The temperature display will not switch between Celsius and Fahrenheit
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- If only the EATC module does not switch between English and Metric, INSTALL a new EATC module.
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