Test Description

IMPORTANT: Do not engage the A/C compressor clutch with the engine running if an A/C mode is not selected at the A/C control switch. 

The numbers below refer to the step numbers on the :

1. 4. Although the normal complaint will be the A/C clutch failing to engage, it is possible for a short circuit to cause the clutch to run when A/C has not been selected. This step is a test for that condition.
2. 7. There is an extremely low probability that both relays will fail at the same time, so the substitution process is one way to check the A/C Thermostat relay. Use a known good relay to do a substitution check.

Fig 1: Identifying A/C Clutch Control Circuit Diagnosis Chart (1 Of 4)

Courtesy of ISUZU MOTOR CO.

Fig 2: Identifying A/C Clutch Control Circuit Diagnosis Chart (2 Of 4)

Courtesy of ISUZU MOTOR CO.

Fig 3: Identifying A/C Clutch Control Circuit Diagnosis Chart (3 Of 4)

Courtesy of ISUZU MOTOR CO.

Fig 4: Identifying A/C Clutch Control Circuit Diagnosis Chart (4 Of 4)

Courtesy of ISUZU MOTOR CO.