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The Centre for Energy Studies, with a financial support by ADEME (French Agency for Environment and Energy Management), has realized a test bench for the measurement of R-134a leak flow rates of Mobile Air-Conditioning) MAC components. The test bench is equiped with an infrared spectrophotometer permitting thorough and fast measurements. The measurement principle is simple. R-134a pressure is generated in gas phase in the component to be tested (in the study, the compressor). This component is located in a leak tight control volume at atmospheric pressure. The control volume is filled in recomposed air as to prevent any external pollution. The control volume is swept by a continuous flow permitting continuous measurement of the R-134a concentration in the measurement cell. Knowing the concentration increase, the control volume and the time, the concentration measure permits the calculation of the leak flow rate.