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Home >> Audi >> 2016 >> S3 Prestige >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> AIR CONDITIONING R1234yf (TOOLS & TESTING EQUIPMENT) -- (SEDAN) >> 87 Air Conditioning >> Working With A/C Service Station >> Pressures, Checking >> Refrigerant Circuit With Ignition Switched On, Checking Pressure >> The Refrigerant Circuit Pressure Is Lower Than Indicated In Table

The Refrigerant Circuit Pressure Is Lower Than Indicated In Table

Not Enough Refrigerant In Refrigerant Circuit

-- Determine refrigerant circuit leaks. Refer to LEAKS, FINDING .

-- Check the pressure relief valve. Refer to PRESSURE RELIEF VALVE .

If pressure relief valve has responded. Refer to PRESSURE RELIEF VALVE .

-- Check the activation of the radiator fan or the radiator fans. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function of the A/C system.

-- On vehicles with shut-off valves for the refrigerant circuit, check the activation and function of this shut-off valve. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function of the A/C system (and the battery regulation). Refer to the REFRIGERANT CIRCUIT / REFRIGERANT CIRCUIT (R1234yf) (vehicle-specific repair information).

-- Check the refrigerant pipes and hoses for cross-section constrictions due to outer damage and inadequate bending. Refer to REFRIGERANT CIRCUIT / REFRIGERANT CIRCUIT (R1234yf) (vehicle-specific repair information) and REFRIGERANT CIRCUIT / REFRIGERANT CIRCUIT (R1234yf) (vehicle-specific repair information).

-- If no error is determined, clean the refrigerant circuit. Refer to REFRIGERANT CIRCUIT, CLEANING .

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