Diagnostic Table
WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to the chart below.
NOTE:
The following table is used to guide diagnosis of the refrigerant system if operating pressures are outside normal limits.
| 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 AIR CONDITIONING . | |||
| Normal to low | High | Compressor - low performance. | ||
| Additional Possible Cause Components Associated With Inadequate Compressor Operation | ||||
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| Additional Possible Cause Components Associated With a Damaged Compressor | ||||
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