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HOMESERVICE MANUALSFORD2004ECONOLINE E150, VAN CARGO, 4.6 WREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 285 (CLIMATE CONTROL SYSTEM)GENERAL PROCEDURESREFRIGERANT SYSTEM TESTSDIAGNOSTIC TABLE
2004 Ford Econoline E150, Van Cargo, 4.6 W

Diagnostic Table

2004 Ford Econoline E150, Van Cargo, 4.6 WSECTION Diagnostic Table
WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: The following table is used to guide diagnosis of the refrigerant system if operating pressures are outside normal limits.
  1. Refer to the chart below. See DIAGNOSTIC CHART .
    DIAGNOSTIC CHART

    High (Discharge) Pressure Low (Suction) Pressure Component - Causes
    High or clutch cycling High Condenser - inadequate airflow.
    High Normal to high Engine - overheating.
    Normal to high Normal Refrigerant overcharge - air in refrigerant.
    Normal to low High Thermostatic expansion valve
    Normal to low Normal to high A/C suction line - partially restricted or plugged (1).
    Normal to low Low or clutch cycling Low refrigerant charge, A/C suction line - partially restricted or plugged.
    Erratic operation or compressor not running Evaporator discharge temperature sensor - poor connection at A/C clutch connector. A/C electrical circuit erratic - see A/C Electrical Circuit Wiring Diagram.
    Normal to low High Compressor - low performance.
    Additional Possible Cause Components Associated With Inadequate Compressor Operation 
    • Compressor drive belt - loose
    • Compressor clutch - slipping
    • Clutch coil open - shorted, or loose mounting
    • Control assembly
    • Clutch wiring circuit - high resistance, open or blown fuse
    • Compressor operation interrupted by PCM
    Additional Possible Cause Components Associated With a Damaged Compressor 
    • Incorrect clutch air-gap
    • Receiver/drier - plugged
    • Refrigerant leaks
    (1) Low pressure reading will be normal to high if pressure is taken at accumulator and if restriction is downstream of service access valve.
RENDER: 1.0x

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