Plug hybid and electric vehicle have during the past year shown an increasing potential, implementing new Li-Ion batteries. These provide a performance similar to today’s fossil fueled vehicles. The drawback of highly efficient cars is the lack of waste heat from engin, used for cabin heating. An alternative to the presently used PTC heater also is able to heat vehicle. PTC heater has a weakness which is engergy consumpsion. PTC heater and tracktion motor use same battery engergy. PTC heater has an adverse effect on fuel efficiency, 30~40 percent is decreaing. To improve fuel efficiency, study of alternative heat source is necessary. One of efficient heat source would be PE parts and traction motor waste heat. In this study, it is being suggested that the system uses PTC heater and waste heat from motor and PE parts. According to the experiment, system efficiency improvement is 14.9%