A/C refrigerant system, checking pressures: Notes

Safety measures, see A/C SYSTEM, SAFETY PRECAUTIONS .

Before checking refrigerant system pressures, check A/C system cooling performance. See A/C SYSTEM COOLING PERFORMANCE, TESTING .

Use high pressure service valve for checking system pressures.

Test requirements 

• Condenser and radiator clean and free of obstructions (clean if necessary)
• Drive belts for compressor and generator in good condition and properly tensioned
• All air ducts, covers and seals OK and correctly installed
• Check DTC memory using VAG 1551 scan tool and eliminate/repair any malfunctions indicated (not affecting A/C system)
• All air distribution flaps reach end positions Engine at normal operating temperature
• Evaporator housing and heater box do not leak air (draw in secondary air) at high fresh air blower speed
• Outside (ambient) temperature must be between 15-45° C (59-113° F)
• Engine running and system set to maximum cooling (AUTO operating mode with LO temperature setting selected):

• Switch compressor on (warning light in ECON button does not light up)
• Temperature selection LO (for driver and passenger side) If the compressor is activated (A/C clutch is switched on):

• Fresh air blower -V2- runs
• Coolant fan -Ml- runs (at least in 1st speed)
• Air flow flap closes and fresh air/recirculated air flap opens (within 1 minute after starting vehicle)