ABSTRACT Electric drive vehicles (EDVs) must incorporate thermal management systems for powertrain-related subsystems, including the power electronics, electric motors, and energy storage system (ESS) as well as the passenger compartment. Multiple independent heating and cooling loops reduce the effectiveness of fuel-saving control strategies, increase weight and volume, and reduce all-electric range. Building on the National Renewable Energy Laboratory's (NREL's) extensive experience, integrated thermal management concepts in an overall vehicle context are being investigated. The initial results of the air conditioning (A/C), passenger compartment, and power electronics KULI models of an electric vehicle (EV) are described. Various concepts for combining the systems will be assessed and the performance compared to a baseline system.