The main objective of this study is to investigate numerically thermal comfort and energy transport inside a passenger car considering spectral solar radiation. We used the discrete ordinates (DO) model considering spectral radiation effects to estimate the spatial temperature distribution for determining solar loads. The Fanger model is used for evaluation of thermal comfort in the passenger car. From numerical results, when considering spectral radiation effect, it is shown that higher cabin temperature is estimated and longer penetration of solar irradiation inside the cabin is predicted. These results show that the spectral radiation effect should be considered for thermal comfort analysis.