Automotive Air Conditioning Diagnosis Chart
An extremely common cause of automotive air conditioner cooling problems happen due to no refrigerant in the system.
Our chart below will help you potentially identify the issue you are experiencing.
Automotive Air Conditioning Diagnosis Chart
| Low Side | High Side | Duct Temp | Possible Cause |
| Low | Low | Warm | low refrigerant charge |
| High | High | Warm | Overcharge of refrigerant |
| High | High | Some Cool | Air in the system or overcharge |
| Normal | Normal | Warm | Moisture in the system |
| Low | Low | Warm | Expansion valve stuck closed |
| Low | Low | Warm | Orfice tube plugged |
| Low | Low | Warm | High side restriction |
| High | Low | Warm | Compressor or control valve failed |
Now that you have potentially diagnosed the issue you're going to need a set of tools for the repair.