Symptom Chart

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
Air inlet door inoperative	Circuitry open/shorted. EATC module. EMTC module. Air inlet door actuator/linkage.	GO to PINPOINT TEST C .
The steering wheel control switch is inoperative/does not operate correctly	Circuitry open/shorted. Steering wheel control switch. EATC module.	GO Pinpoint Test E.
No communication with the electronic automatic temperature control (EATC) module	Circuitry open/shorted. EATC module communication network.	GO to PINPOINT TEST F .
The EATC system is inoperative, intermittent or incorrect operation	Circuitry open/shorted. Input sensor(s)/erratic input signals. Automatic temperature control aspirator hose and elbow.	GO to PINPOINT TEST G .
Incorrect/erratic direction of airflow from outlets	Circuitry. Door actuator. Mode door binding or stuck. EMTC module or EATC module Door actuator arm not connected to the door crank.	GO to PINPOINT TEST D .
Insufficient, erratic or no heat	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.	GO to PINPOINT TEST H .
The air conditioning (A/C) is inoperative/does not operate correctly	Open fuse. Circuitry open/shorted. A/C system discharged/low charge. A/C pressure cutoff switch. PCM. EATC module. EMTC module. A/C cycling switch. A/C compressor clutch air gap. A/C clutch relay.	GO to PINPOINT TEST I .
The A/C is always on	Circuitry shorted. PCM. A/C compressor clutch air gap. A/C clutch relay.	GO to PINPOINT TEST J .
The temperature control is inoperative/does not operate correctly - EMTC	Circuitry open/shorted. EMTC module. Temperature blend door. Temperature blend door actuator.	GO to PINPOINT TEST D .
The blower motor is inoperative - EMTC	Fuse. Circuitry open/shorted. A/C blower motor switch. Blower motor relay. A/C blower motor.	GO to PINPOINT TEST K .
The blower motor does not operate correctly - EMTC	Circuitry shorted. A/C blower motor resistor. A/C blower motor switch.	GO to PINPOINT TEST L .
The blower motor is inoperative - EATC	Circuitry open/shorted. Blower motor relay. A/C blower motor. A/C blower motor speed control.	GO to PINPOINT TEST M .
The blower motor does not operate correctly - EATC	Circuitry open/shorted. A/C blower motor speed control. EATC module.	GO to PINPOINT TEST N .
Insufficient air conditioning (A/C) cooling	Low refrigerant level. Temperature blend door actuator.	CARRY OUT the refrigerant system tests. REFER to REFRIGERANT SYSTEM TESTS . If OK, GO to PINPOINT TEST D .
The temperature set point does not repeat after turning the ignition switch OFF	Open fuse. Circuitry open/shorted. EATC module.	CHECK circuit 729 (RD/WH) for a short or open and REPAIR as necessary. If OK, INSTALL a new EATC module.
The temperature display will not switch between Celsius and Fahrenheit	EATC module. HEC module.	If the instrument cluster does not switch between English and Metric, REFER to INSTRUMENT CLUSTER . If only the EATC module does not switch between English and Metric, INSTALL a new EATC module. REFER to CONTROL COMPONENTS .