- No communication with the dual automatic temperature control (DATC) or electronic automatic temperature control (EATC) module
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- Fuse(s)
- Circuitry open
- DATC/EATC module communication network
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- The DATC/EATC system is inoperative, intermittent or incorrect operation
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- Fuse(s)
- Circuitry open
- Automatic temperature control aspirator hose and elbow
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- Air inlet door is inoperative
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- Circuitry open/shorted
- DATC/EATC module
- EMTC module
- Air inlet door actuator/linkage
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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 DATC/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 air conditioning (A/C) is inoperative/does not operate correctly
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- Open fuse
- Circuitry short/open
- A/C system discharged/low charge
- PCM
- DATC/EATC module
- EMTC module
- A/C compressor clutch air gap
- A/C clutch relay
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- The air conditioning (A/C) is always on
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- Circuitry short/open
- DATC/EATC module
- EMTC module
- PCM
- A/C compressor clutch air gap
- A/C clutch relay
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- Temperature control is inoperative/does not operate correctly
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- Circuitry open/shorted
- DATC/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(s)
- 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 - DATC/EATC
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- Fuse(s)
- Circuitry short/open
- Blower motor relay
- A/C blower motor
- DATC/EATC module
- A/C blower motor speed control
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- The blower motor does not operate correctly - DATC/EATC
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- Circuitry short
- A/C blower motor speed control
- DATC/EATC module
- A/C blower motor speed control
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- The steering wheel control switch is inoperative/does not operate correctly
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- Circuitry short/open
- Steering wheel control switch
- DATC/EATC module
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- The dual temperature control is inoperative/does not operate correctly
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- Temperature blend door/actuator broken/binding
- DATC 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 DATC 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
- DATC/EATC module
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- CHECK circuit SBP07 (WH/RD) for a short or open and repair as necessary. If okay, INSTALL a new DATC/EATC module.
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- The temperature display will not switch between Celsius and Fahrenheit
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- DATC/EATC module
- IC module
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- If only the EATC module does not switch between English and Metric, INSTALL a new DATC/EATC module.
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- Inaccurate external temperature display
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