In the current study, amount of heat transfer to the passenger compartment through the floor, which is one of the cooling load components of the vehicle, under normal working conditions were examined. For detailed investigations, floor of the passenger compartment was sub-divided into 11 regions by considering the material properties and the thermal condition under the region. By referencing the test results and making some assumptions, mean temperatures of the regions under the floor were determined. And then the heat transfer from the bottom of the vehicle to the passenger compartment was calculated. At the end of study, mean temperatures, heat transfers and heat fluxes of the regions were examined and some improvement modifications advised for heat transfer and economy points of views.