F5C Fuel System: High Pressure Pump Fuel Quantity Not Plausible At Low Idle. Check For Clogged Fuel Filter, Leakage In High Pressure System, Low Pressure Pump Red Hydraulic Circuit, High Pressure Pump Low Efficiency, Or Injectors For Tightness.
Hissing noise at expansion valve, Loss of refrigerant.Restriction in refrigerant system.Check receiver-dryer for uniformity of temperature.