A/C Diagnostics Chart

2016 Chevrolet Corvette Z06, 2D Coupe, Standard TransSECTION A/C Diagnostics Chart
A/C System Concern Potential Causes
Compressor Inoperative Electrical Wiring Issue
No or Low Refrigerant Charge
Compressor Internal Malfunction
Compressor Clutch Malfunction
A/C Pressure Sensor Malfunction
Evaporator Air Temperature (EAT) Malfunction
HVAC Controls Malfunction
Low Side Gauge Reading  High Side Gauge Reading  Potential Causes 
Same as High Side Same as Low Side No or Low Refrigerant Charge
Compressor Malfunction
A/C Pressure Sensor Malfunction
EAT Malfunction
HVAC Controls Malfunction
Normal Normal Temperature Actuator Malfunction
Temperature Door Malfunction
Low Low Low Refrigerant Charge
Restriction between the Compressor Outlet and Low Side Port
Low/Normal Evaporator Freezing/EAT Malfunction
High Compressor Stuck at Maximum Displacement/EAT Malfunction
Normal/High Normal/High PAG or POE Oil Overcharge
High Low Restriction between the Low Side Port and Compressor Inlet
Expansion Device Stuck Open
Compressor has Low Displacement or Internal Malfunction
High Malfunctioning Cooling Fans
Refrigerant Overcharge
Restricted Condenser Air Flow
Air in A/C System
NOTE: Restrictions can occur in any part of an A/C system and may result in various gauge pressure values, depending on the system design and service port locations. The use of a non-contact, infrared thermometer can help diagnose a restricted A/C system with the ability to quickly observe significant, unexpected temperature changes in components and plumbing due to debris, contamination, pinched/damaged hoses, etc.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.