| Diagnostic Chart for Air Conditioning System | ||||||||
|---|---|---|---|---|---|---|---|---|
| Condition | Low Side Pressure | High Side Pressure | Sight Glass | Suction Line | Receiver Dryer | Liquid Line | Discharge Line | Discharge Air |
| Lack of Refrigerant | Very low | Very low | Clear | Slightly cool | Slightly warm | Slightly warm | Slightly warm | Warm |
| Lack of Refrigerant | Low | Low | Bubbles | Cool | Warm to hot | Warm | Warm to hot | Slightly cool |
| Compressor Failure | High | Low | Clear | Cool | Warm | Warm | Warm | Slightly cool |
| Condenser Malfunction | High | High | Clear to occasional bubbles | Slightly cool to warm | Hot | Hot | Hot | Warm |
| Expansion Valve Stuck Open | High | High to Normal | Clear | Cold - sweating or frosting heavily | Warm | Warm | Hot | Slightly cool |
| Expansion Valve Stuck Closed | Low | Low | Clear | Cold - sweating or frosting heavily at valve inlet | Warm | Warm | Hot | Slightly cool |
| Restriction between Condenser and Expansion Valve | Low | Low | Clear | Cool | Cool or sweating or frosting | Cool or sweating or frosting | Hot to point of restriction | Slightly cool |
| Restriction between Compressor and Condenser | High | High, normal or low | Clear | Slightly cool to warm | Warm or hot | Warm or hot | Hot | Warm |
| Normal | Normal | Normal | Clear | Cool Possible light sweat | Warm | Warm | Hot | Cool |
| Source: Dan, Brattain Int'l Salem, OR | ||||||||
| 08/12/12 | ||||||||