Symptom Table

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Some PCM DTCs may inhibit air conditioning (A/C) operation. If any PCM DTCs are retrieved, diagnose those first. REFER to INTRODUCTION - GASOLINE article.

SYMPTOM TABLE

Condition	Possible Sources	Action
No communication with the electronic automatic temperature control (EATC) module	Fuse(s) Circuitry open EATC module communication network	GO to PINPOINT TEST F .
The EATC system is inoperative, intermittent or incorrect operation	Fuse(s) Circuitry open 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 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 E .
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	Fuse(s) 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	GO to PINPOINT TEST I .
The air conditioning (A/C) is always on	Circuitry short/open EATC module EMTC module PCM A/C compressor clutch air gap A/C clutch relay Instrument cluster Instrument cluster configuration	GO to PINPOINT TEST J .
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 K .
The blower motor is inoperative - EMTC	Fuse(s) Circuitry open/shorted A/C blower motor switch Blower motor relay A/C blower motor EMTC module	GO to PINPOINT TEST L .
The blower motor does not operate correctly - EMTC	Circuitry shorted A/C blower motor resistor A/C blower motor switch	GO to PINPOINT TEST M .
The blower motor is inoperative - EATC	Fuse(s) Circuitry short/open Blower motor relay A/C blower motor EATC module A/C blower motor speed control	GO to PINPOINT TEST N .
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 O .
The auxiliary blower motor is inoperative	Fuse Circuitry short/open Auxiliary blower motor resistor Auxiliary blower motor	GO to PINPOINT TEST P .
The auxiliary blower motor does not operate correctly	Fuse(s) 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	GO to PINPOINT TEST Q .
The temperature control is inoperative/does not operate correctly using the front/rear auxiliary climate controls	Circuitry short/open Auxiliary blend door actuator Auxiliary blend door	GO to PINPOINT TEST R .
The panel/floor control is inoperative/does not operate correctly using the front/rear auxiliary climate controls	Circuitry short/open Auxiliary mode door actuator Auxiliary mode door	GO to PINPOINT TEST S .
The temperature, panel/floor and blower motor controls are inoperative/do not operate correctly using the front/rear auxiliary climate controls	Circuitry short/open Rear auxiliary control	GO to PINPOINT TEST T .
The dual temperature control is inoperative/does not operate correctly	Temperature blend door/actuator broken/binding 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	Fuse Circuitry short/open EATC module	VERIFY smart junction box (SJB) fuse 7 (7.5A) is OK. If OK, CHECK circuit 483 (RD) 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 IC module	If the instrument cluster does not switch between English and Metric, INSTRUMENT CLUSTER AND PANEL ILLUMINATION . If only the EATC module does not switch between English and Metric, INSTALL a new EATC module.