Symptom Chart - Climate Control Systems
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Symptom Chart - Climate Control Systems
| Condition |
Possible Sources |
Action |
- Incorrect/erratic direction of airflow from outlets
|
- Function selector switch
- Vacuum hose/harness
- Vacuum control motor
- A/C vacuum check valve
- Vacuum reservoir tank
- Air distribution door/linkage
|
|
- Insufficient, erratic or no heat
|
- Low engine coolant level
- Engine overheating
- Plugged or partially plugged heater core
- Temperature blend door binding/stuck
- Temperature blend door actuator
|
|
- The air conditioning (A/C) is inoperative/does not operate correctly
|
- Fuse(s)
- Circuitry open/short
- A/C cycling switch
- Low refrigerant system charge
- Function selector switch
- Pressure cutoff switch
- A/C control relay
- PCM
- A/C compressor clutch air gap
- A/C compressor clutch field coil
|
|
- The air conditioning (A/C) is always on
|
- Circuitry short
- Function selector switch
- A/C control relay
- PCM
- A/C compressor clutch air gap
|
|
- Insufficient air conditioning (A/C) cooling - auxiliary system
|
- Thermostatic expansion valve
- Leaking or restricted vacuum hose
- Vacuum control motor
- Sticking mode door
|
|
- Temperature control is inoperative/does not operate correctly
|
- Fuse(s)
- Circuitry open/short
- Temperature blend door actuator
- Temperature control switch
|
|
- The blower motor is inoperative
|
- Fuse(s)
- Circuitry open/short
- Blower motor relay
- Function selector switch
- Blower motor
|
|
- The blower motor does not operate correctly
|
- Blower motor switch
- Blower motor resistor
- Circuitry open/short
|
|
- The auxiliary blower motor is inoperative
|
- Fuse(s)
- Circuitry open/short
- Auxiliary blower motor relay
- Auxiliary blower motor switch
- Auxiliary high speed blower motor relay
- Auxiliary blower motor
|
|
- The auxiliary blower motor does not operate correctly
|
- Auxiliary blower motor switch
- Auxiliary blower motor resistor
- Circuitry open/short
|
|
- The auxiliary temperature/mode is inoperative/does not operate correctly
|
- Auxiliary temperature actuator
- Auxiliary mode actuator
- Auxiliary vacuum source line
|
- If both temperature and mode are affected, REPAIR the vacuum source line for an obstruction or leak. TEST the system for normal operation.
- If the temperature or mode alone are affected, INSPECT the temperature or mode door for a binding or broken condition. If no condition is found, INSTALL a new actuator. TEST the system for normal operation.
|
- A/C pressure relief valve discharging
|
- High system pressure
- A/C pressure relief valve
|
- CHECK the high side system pressure. If the pressure is below the A/C pressure relief valve open pressure, INSTALL a new A/C pressure relief valve. If the system pressure is above the A/C pressure relief valve open pressure, REPAIR the system for a restriction
|