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Home >> Audi >> 2020 >> SQ8 Premium Plus >> Repair and Diagnosis >> External Pages >> Different car >> Section 210 (Air Conditioning (Refrigerant R1234YF Servicing) (Tools & Testing Equipment)) >> 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

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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) and refer to the Refrigerant Circuit (vehicle-specific service information).

-- Check the refrigerant pipes and hoses for cross-section constrictions due to outer damage and inadequate bending radii. Refer to Refrigerant Circuit (vehicle-specific service information) and Refrigerant Circuit (vehicle-specific service information).

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

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