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An adequate mass flow distribution on instrument panel air vents is fundamental for passengers thermal comfort in an automobile. Computational fluid dynamics (CFD) is a useful tool to achieve this goal, since one can identify flow patterns and details that cannot be seen during experimental tests. Despite the software and hardware developments in the last years it is still necessary and clever to make simplifications in the numerical models: the simpler and still representative the model the better it is. In this context the present work aims to study the influence of the HVAC (Heating, Ventilation and Air Conditioning) system geometry on mass flow distribution simulation. A total of 8 different domains were studied: Complete HVAC system in recirculation position, Complete HVAC system in external intake position, HVAC cut in the filter area, HVAC cut in the evaporator region and one model without HVAC system.