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Home >> Audi >> 2019 >> A4 Premium >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> General Servicing >> AIR CONDITIONING [R1234yf Servicing] (REFRIGERANT CIRCUIT) >> 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 radius. Refer to REFRIGERANT CIRCUIT / REFRIGERANT CIRCUIT [R1234yf] / REFRIGERANT CIRCUIT PIPES AND HOSES (vehicle-specific repair information) and REFRIGERANT CIRCUIT PIPES AND HOSES (vehicle-specific repair information).

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

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