Diagnostic Table
WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. 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 REFERENCE
| 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 | Fixed orifice tube - missing O-rings leaking/missing. | ||||
| 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 (if equipped). | ||||
| 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 . | |||||
| 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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