Diagnostic Table
WARNING: This page is about a different car, the 2005 Lincoln Navigator and 2005 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to REFRIGERANT SYSTEM GUIDE DIAGNOSIS .
NOTE:
The following table is used to guide diagnosis of the refrigerant system if operating pressures are outside normal limits.
REFRIGERANT SYSTEM GUIDE DIAGNOSIS
| 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 sticking. | ||||
| 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(2). A/C cycling switch - sticking closed. | ||||
| Erratic operation or compressor not running | A/C cycling switch. Poor connection at A/C clutch connector or clutch cycling switch connector. A/C Electrical circuit erratic - see AIR CONDITIONING (Expedition) or AIR CONDITIONING (Navigator) . | |||||
| Normal to low | High | Compressor - low performance. | ||||
| Additional Possible Cause Components Associated With Inadequate Compressor Operation | ||||||
|
||||||
| Additional Possible Cause Components Associated With a Damaged Compressor | ||||||
|
||||||
|
||||||