Symptom Chart

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

PROBLEM SYMPTOM CHART

Condition	Possible Sources	Action
Air inlet door inoperative	Circuitry short/open. Electronic manual temperature control (EMTC) module. Air inlet door actuator/linkage.	GO to PINPOINT TEST A .
Incorrect/erratic direction of airflow from outlets	Circuitry. Door actuator. Mode door binding or stuck. EMTC module. Door actuator arm not connected to the door crank.	GO to PINPOINT TEST B .
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 C .
The air conditioning (A/C) is inoperative/does not operate correctly	Open fuse. Circuitry short/open. A/C system discharged/low charge. A/C dual function pressure switch. PCM. Smart Junction Box (SJB). EMTC module. A/C cycling switch. A/C compressor clutch air gap. A/C clutch relay.	GO to PINPOINT TEST D .
The A/C is always ON	Circuitry short. PCM. Smart Junction Box (SJB). A/C compressor clutch air gap. A/C clutch relay.	GO to PINPOINT TEST E .
The temperature control is inoperative/does not operate correctly	Circuitry open/shorted. EMTC module. Temperature blend door. Temperature blend door actuator.	GO to PINPOINT TEST B .
The blower motor is inoperative	Fuse. Circuitry open/shorted. A/C blower motor switch. Blower motor relay. A/C blower motor.	GO to PINPOINT TEST F .
The blower motor does not operate correctly	Circuitry short. A/C blower motor resistor. A/C blower motor switch.	GO to PINPOINT TEST G .
Insufficient air conditioning (A/C) cooling	Low refrigerant level. Temperature blend door actuator.	GO to PINPOINT TEST B .