Symptom Chart

WARNING: This page is about a different car, the 2004 Ford Explorer Sport Trac. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
Incorrect/erratic direction of airflow from outlet(s)	No vacuum to the function selector switch. Function selector switch leaks vacuum. Air distribution door binding/stuck. Vacuum line kinked/pinched. Vacuum control motor. Vacuum reservoir tank. Vacuum actuator arm not connected to the door lever.	Go to PINPOINT TEST A: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S) .
Insufficient, erratic, or no heat	Open fuse. Low engine coolant level. Engine overheating. Heater control valve. Plugged or partially plugged heater core. Temperature blend door binding/stuck. Temperature blend door actuator. Temperature blend door actuator circuit open/short.	Go to PINPOINT TEST B: INSUFFICIENT, ERRATIC, OR NO HEAT .
The air conditioning (A/C) is inoperative/does not operate correctly	Fuse. A/C control relay. Circuit open/short. A/C cycling switch. A/C system discharged/low charge. Pressure cutoff switch. Function selector switch.	Go to PINPOINT TEST C: THE AIR CONDITIONING (A/C) IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
The air conditioning (A/C) is always on	Circuit short. A/C cycling switch. A/C control relay. Function selector switch.	Go to PINPOINT TEST D: THE AIR CONDITIONING (A/C) IS ALWAYS ON .
No operation in all the temperature settings	Open fuse. Circuit open/short. Temperature control switch. Temperature blend door actuator. Temperature blend door binding/stuck.	Go to PINPOINT TEST E: NO OPERATION IN ALL THE TEMPERATURE SETTINGS .
The blower motor is inoperative	Open fuse. Circuit open/short. Blower motor. Function selector switch. Blower motor relay.	Go to PINPOINT TEST F: THE BLOWER MOTOR IS INOPERATIVE .
The blower motor does not operate correctly	Circuit open/short. Blower motor resistor. Blower motor switch. Blower motor.	Go to PINPOINT TEST G: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY .
The blower motor operates continuously in high speed	Circuit short. Blower motor switch. High-speed blower motor relay.	Go to PINPOINT TEST H: THE BLOWER MOTOR OPERATES CONTINUOUSLY IN HIGH SPEED .
No operation in high blower setting	Circuit open. Blower motor switch. High-speed blower motor relay. Blower motor resistor.	Go to PINPOINT TEST I: NO OPERATION IN HIGH BLOWER SETTING .
No operation in lower speeds	Open circuit. High-speed blower motor relay. Blower motor resistor.	Go to PINPOINT TEST J: NO OPERATION IN LOWER SPEEDS .
The console blower motor is inoperative	Circuit open/short. Console blower motor. Console blower motor resistor. Rear control assembly.	Go to PINPOINT TEST K: THE CONSOLE BLOWER MOTOR IS INOPERATIVE .
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 E: NO OPERATION IN ALL THE TEMPERATURE SETTINGS .