AIR CONDITIONING & HEAT
AIR CONDITIONING TROUBLESHOOTING
| WARNING: | This is GENERAL information. This article is not intended to be specific to any unique situation or individual vehicle configuration. The purpose of this Troubleshooting information is to provide a list of common causes to problem symptoms. For model-specific Troubleshooting, refer to SUBJECT, DIAGNOSTIC, or TESTING articles available in the section(s) you are accessing. |
BASIC AIR CONDITIONING TROUBLESHOOTING CHART
| CONDITION | POSSIBLE CAUSE |
|---|---|
| Compressor Not Working | Compressor clutch circuit open. |
| ..... | Compressor clutch coil inoperative. |
| ..... | Poor clutch ground connection. |
| ..... | Fan belts loose. |
| ..... | Thermostatic switch inoperative. |
| ..... | Thermostatic switch not adjusted. |
| ..... | Ambient temperature switch open. |
| ..... | Superheat fuse blown. |
| Excessive Noise or Vibration | Missing or loose mounting bolts. |
| ..... | Bad idler pulley bearings. |
| ..... | Fan belts not tightened correctly. |
| ..... | Compressor clutch contacting body. |
| ..... | Excessive system pressure. |
| ..... | Compressor oil level low. |
| ..... | Damaged clutch bearings. |
| ..... | Damaged reed valves. |
| ..... | Damaged compressor. |
| Insufficient or No Cooling; Compressor Working | Expansion valve inoperative. |
| ..... | Heater control valve stuck open. |
| ..... | Low system pressure. |
| ..... | Blocked condenser fins. |
| ..... | Blocked evaporator fins. |
| ..... | Vacuum system leak. |
| ..... | Vacuum motors inoperative. |
| ..... | Control cables improperly adjusted. |
| ..... | Restricted air inlet. |
| ..... | Mode doors binding. |
| ..... | Blower motor inoperative. |
| ..... | Temperature above system capacity. |
