A/C Diagnostics Chart
| Low Side Gauge Reading | High Side Gauge Reading | Potential Causes |
|---|---|---|
| Low | Low | Low Refrigerant Charge |
| Restriction between Compressor and High Side port | ||
| Low/Normal | Evaporator Freezing | |
| High | Restriction between the Low Side and High Side ports or Restricted TXV/Orifice Tube | |
| Compressor Stuck at Maximum Displacement | ||
| High | Low | Compressor has Low Displacement or Internal Malfunction |
| High | Malfunctioning Cooling Fans | |
| Refrigerant Overcharge | ||
| Restriction between the Low Side Port and Compressor Inlet | ||
| Restricted Condenser Air Flow | ||
| Expansion Device Stuck Open | ||
| Air in A/C System | ||
| Normal/High | Normal/High | Refrigerant Contamination |
| PAG or POE Oil Overcharge |
A/C Diagnostics Chart