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HOMESERVICE MANUALSFORD2004PICKUP F350 SUPER DUTY, 4D PICKUP, 6.8 S, RWD, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 595 (HVAC SYSTEM - CLIMATE CONTROL SYSTEM-GENERAL INFORMATION)DIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEMSYMPTOM CHARTNOTES
2004 Ford Pickup F350 Super Duty, 4D Pickup, 6.8 S, RWD, Automatic

Symptom Chart: Notes

2004 Ford Pickup F350 Super Duty, 4D Pickup, 6.8 S, RWD, AutomaticSECTION Notes
WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
CLIMATE CONTROL SYSTEM SYMPTOM CHART

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.
  • Powertrain control module (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.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.