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Owing to the dynamic life style, considerable time is spent in traveling. Consequently, the demand for thermal comfort of passengers in vehicles has increased. And, to provide thermal comfort, the vehicles are equipped with Heating, Ventilation and Air Conditioning (HVAC) systems. However, the tendency to use more glass in vehicle styling, fuel-economy constraints, environmentally safe refrigerants and reduced condenser air flow, particularly at idling conditions, hampers the goal of achieving the desired thermal comfort of passengers. Thus, it is imperative to evaluate the performance of the HVAC units and the effect of their delivery systems to predict the impact on the airflow, temperature distribution and thermal comfort of passengers. CFD simulations have gained importance for such evaluations, which include both steady state and transient calculations.