- No communication with the dual automatic temperature control (DATC) module
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- Fuse.
- Circuitry.
- DATC module communication network.
- DATC module not connected.
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- The DATC system is inoperative, intermittent or incorrectly operating
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- Circuitry.
- Input sensors or erratic input signals.
- Charging system.
- In-car temperature control sensor hose and elbow (no aspiration).
- Air trapped in heater coolant circuits.
- Missing or invalid SCP messages.
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- Incorrect/erratic direction of airflow from outlets
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- Circuitry.
- Door actuator.
- Airflow door binding or stuck.
- DATC module.
- Door actuator arm not connected to the door crank.
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- Insufficient, erratic, or no heat
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- Circuitry.
- Low engine coolant level.
- Air trapped in heater coolant circuit.
- Plugged or partially plugged heater core.
- Bypass door actuator binding or stuck open.
- Coolant control valve.
- DATC module.
- Evaporator discharge at temperature sensor.
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- Insufficient heat during engine idle
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- Low engine coolant level.
- Cold engine.
- Bypass door actuator binding or stuck.
- Auxiliary coolant pump.
- Engine coolant thermostat.
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- Full heat only in all modes
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- Fuse.
- Circuitry.
- Coolant control valve.
- DATC module.
- Evaporator discharge at temperature sensor.
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- The dual temperature control is inoperative/does not operate correctly
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- Circuitry.
- DATC module.
- Coolant control valve.
- Low coolant level.
- Air trapped in coolant circuit.
- Incorrect heater hose connections.
- Air temperature sensors.
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- The air conditioning (A/C) is inoperative/does not operate correctly
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- Fuse.
- Circuitry.
- A/C clutch relay.
- Evaporator discharge temperature sensor.
- A/C system discharged or low charge.
- A/C pressure transducer.
- DATC module.
- PCM.
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- The air conditioning (A/C) is always on
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- Circuitry.
- A/C control.
- A/C clutch relay.
- Evaporator air discharge sensor.
- DATC module.
- PCM
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- The blower motor is inoperative
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- Circuitry.
- Blower motor.
- Blower motor speed control.
- Blower motor relay.
- DATC module.
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- The blower motor does not operate correctly
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- Blower motor speed control.
- DATC module.
- Circuitry.
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- The temperature set point does not repeat after turning the ignition switch OFF
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- Fuse.
- Circuitry.
- DATC module.
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- The temperature display will not switch between Celsius and Fahrenheit
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- INSTALL a new DATC module. REFER to CONTROL COMPONENTS
. TEST the system for normal operation.
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- The exterior temperature display does not function correctly
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- Circuitry.
- DATC module.
- Ambient temperature sensor.
- Ambient temperature sensor mounting.
- Missing or invalid vehicle speed SCP signal.
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