Symptom Diagnostic Charts

Check the following before following the fault-diagnosis table:

- That the drive belt for the compressor is in good condition and correctly tensioned.

- That air is entering the inside of the car through the vents.

- That the flow of air through the condenser is not obstructed.

- That the electromagnetic clutch for the compressor cuts in and out when the AC system is switched on - the ambient temperature must be at least +8 or 9°C (46-48°F). If the compressor fails to cut in, the system may be starved of refrigerant (cut-in prevented by the pressure switch on the receiver).

- That the AC fan cuts in when the system is switch on.

How To Use The Fault Diagnosis Table

Fault Table I:

Fault Table II:

Identify the possible cause of the relevant symptom (marked with 'X' in the table) and read along the line. Identify all possible causes and then decide which is the most likely. Perform all the simple checks first. Note that the possible causes are not listed in any order of probability.