A/C Diagnostics Chart
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
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 |