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Refrigerant Lines

To maintain similar flow velocities around the system, the diameter of the Refrigerant Lines varies to suit the two-pressure/temperature conditions. The larger diameters are installed in the low pressure/temperature zone and the smaller diameters are installed in the high pressure/temperature zone. Low and high pressure service fittings are incorporated into the refrigerant lines for system servicing.

Fig 1: A/C Service Fittings
G04730779Courtesy of BMW OF NORTH AMERICA, INC.
Fig 2: A/C Service Lines At Condenser
G04730780Courtesy of BMW OF NORTH AMERICA, INC.