The present study is aimed to characterize the compact heat exchangers used in automotive air-conditioning systems. Mathematical models of an automotive air-conditioning evaporator and condenser have been developed for the prediction of their performance under operating conditions. The models consider the heat transfer correlations for the fluids inside the evaporator and condensers. Automotive refrigerant heat exchangers are manufactured with different designs, usually containing various flow passages with several fin geometries. In the present work the evaporator is a finned-tube heat exchanger, and there are two types of condensers: finned-tube, called type A and a finned-plate called type B. The models have been validated over a variety of operating conditions, showing good agreement with available experimental data.