Symptom Chart

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the electronic automatic temperature control (EATC) module	Circuitry short/open. EATC module communication network.	Go To PINPOINT TEST E: NO COMMUNICATION WITH THE ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE .
The EATC system is inoperative, intermittent or incorrect operation	Circuitry short/open. Input sensor (s)/erratic input signals. Automatic temperature control aspirator hose and elbow.	Go To PINPOINT TEST F: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT OPERATION
Incorrect/erratic direction of airflow from outlets	Circuitry short/open. 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: DTC B1263 MODE DOOR FAILURE / INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S) .
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 G: INSUFFICIENT, ERRATIC OR NO HEAT .
The A/C is inoperative/does not operate correctly	Open fuse. Circuitry short/open. A/C system discharged/low charge. A/C pressure transducer. PCM. EATC module. EMTC module. A/C cycling switch. A/C compressor clutch air gap. A/C clutch relay.	Go To PINPOINT TEST H: THE A/C DOES NOT OPERATE/DOES NOT OPERATE CORRECTLY .
The A/C is always on	Circuitry short/open. EATC module. EMTC module. PCM. A/C compressor clutch air gap. A/C clutch relay.	Go To PINPOINT TEST I: THE AIR CONDITIONING (A/C) IS ALWAYS ON .
The temperature control is inoperative/does not operate correctly	Circuitry open/shorted. EMTC module. EATC module. Temperature blend door. Temperature blend door actuator. Door actuator arm not connected to the door crank.	Go To PINPOINT TEST J: DTC B2266 OR B2267: TEMPERATURE BLEND DOOR OPEN/SHORT TO GROUND / TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
The blower motor is inoperative - EMTC	Fuse. Circuitry open/shorted. A/C blower motor switch. Blower motor relay. A/C blower motor. EMTC module. SJB.	Go To PINPOINT TEST K: THE BLOWER MOTOR IS INOPERATIVE - EMTC .
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 DOES NOT OPERATE CORRECTLY - EMTC .
The blower motor is inoperative - EATC	Circuitry short/open. Blower motor relay. A/C blower motor. EATC module. SJB. A/C blower motor speed control.	Go To PINPOINT TEST M: THE BLOWER MOTOR IS INOPERATIVE - EATC .
The blower motor does not operate correctly - EATC	Circuitry short/open. A/C blower motor speed control. EATC module. A/C blower motor speed control.	Go To PINPOINT TEST N: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - EATC .
The auxiliary blower motor is inoperative	Fuse. Circuitry short/open. Auxiliary blower motor resistor. Auxiliary blower motor.	Go To PINPOINT TEST O: THE AUXILIARY BLOWER MOTOR IS INOPERATIVE .
The auxiliary blower motor does not operate correctly	Fuse. Circuitry short/open. Auxiliary blower motor relay. Auxiliary blower motor speed relay 1. Auxiliary blower motor speed relay 2. Rear auxiliary control. Auxiliary blower motor resistor.	Go To PINPOINT TEST P: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLY .
The auxiliary temperature control only is inoperative/does not operate correctly	Fuse. Circuitry short/open. SJB. Auxiliary blend door actuator. Auxiliary blend door.	Go To PINPOINT TEST Q: THE AUXILIARY TEMPERATURE CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
The auxiliary panel/floor control only is inoperative/does not operate correctly	Fuse. Circuitry short/open. SJB. Auxiliary mode door actuator. Auxiliary mode door.	Go To PINPOINT TEST R: THE AUXILIARY PANEL/FLOOR CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
The auxiliary temperature and panel/floor control is inoperative/does not operate correctly	Fuse. Circuitry short/open. Rear auxiliary control. SJB.	Go To PINPOINT TEST S: THE AUXILIARY TEMPERATURE AND PANEL/FLOOR CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
Insufficient air conditioning (A/C) cooling	Low refrigerant level. Temperature blend door actuator.	CARRY OUT the refrigerant system tests. If OK, Go To PINPOINT TEST J: DTC B2266 OR B2267: TEMPERATURE BLEND DOOR OPEN/SHORT TO GROUND / TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
The dual temperature control is inoperative/does not operate correctly	Temperature blend door/actuator broken/binding EMTC/EATC module Low A/C refrigerant charge	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.
The temperature set point does not repeat after turning the ignition switch OFF	Open fuse. Circuitry short/open. EATC module.	CHECK circuit 1001 (WH/YE) for a short or open and repair as necessary. If okay, INSTALL a new EATC module.
The temperature display will not switch between Celsius and Fahrenheit	EATC module. IC module.	If the instrument cluster does not switch between English and Metric, refer to INFORMATION, GAUGES & WARNING DEVICES . If only the EATC module does not switch between English and Metric, INSTALL a new EATC module.