Chart B No Compressor Operation

CIRCUIT DESCRIPTION

The compressor clutch is directly controlled by different components under different engine configurations. In the 5.0 Liter Engine configuration, the ECC Head requests the compressor on, and depending on other inputs such as engine coolant temperature, cycling switch status, etc. the ECM will or will not engage the compressor clutch via the A/C Cutout Relay.

NOTES ON TROUBLE TREE

Any of the following conditions can cause a compressor operation problem:

1. Blown A/C fuse.

2. Opens or Shorts to Ground.

3. Faulty Cycling or Low Freon Press. Switch.

4. Faulty A/C Cutout Relay.

5. Faulty Compressor Clutch.

6. Faulty ECC Head or ECM.

7. Low Refrigerant Pressure.

8. High Engine Temperature

9. Faulty P/S Pressure Switch.