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Refrigerant Pressure with Manifold Gauge Set: Inspection

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
PROBABLE CAUSE REFERENCE CHART

Symptoms Probable cause Repair order
High-pressure side is unusually high.
  • Defective condenser fan motor
  • Clogged condenser fin
  • Too much refrigerant
  • Air inside the system
  • Defective receiver dryer (condenser)
  • Replace the fan motor.
  • Clean the condenser fin.
  • Discharge refrigerant.
  • Replace the condenser.
  • After evacuating again, charge an appropriate amount of refrigerant.
High-pressure side is unusually low.
  • Defective compressor
  • Not enough refrigerant
  • Clogged expansion valve
  • Expansion valve frozen temporarily by moisture.
  • Replace the compressor.
  • Check for leaks.
  • Replace the expansion valve.
  • Fully evacuate the expansion valve.
Low-pressure side is unusually high.
  • Defective compressor
  • Defective expansion valve
  • Too much refrigerant
  • Replace the compressor.
  • Replace the expansion valve.
  • Discharge refrigerant.
Low-pressure side is unusually low.
  • Not enough refrigerant
  • Clogged expansion valve
  • Expansion valve frozen temporarily by moisture.
  • Saturated receiver dryer (condenser)
  • Check for leaks.
  • Replace the expansion valve.
  • Replace the condenser.
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